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Known Exploited Vulnerability
9.8
CRITICAL CVSS 3.1
CVE-2025-26399
SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability - [Actively Exploited]
Description

SolarWinds Web Help Desk was found to be susceptible to an unauthenticated AjaxProxy deserialization remote code execution vulnerability that, if exploited, would allow an attacker to run commands on the host machine. This vulnerability is a patch bypass of CVE-2024-28988, which in turn is a patch bypass of CVE-2024-28986.

INFO

Published Date :

Sept. 23, 2025, 5:15 a.m.

Last Modified :

March 9, 2026, 7:16 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

SolarWinds Web Help Desk contain a deserialization of untrusted data vulnerability in AjaxProxy that could allow an attacker to run commands on the host machine.

Required Action :

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Known Ransomware Campaign Use:

Unknown

Notes :

https://www.solarwinds.com/trust-center/security-advisories/cve-2025-26399 ; https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_12-8-7-hotfix-1_release_notes.htm ; https://nvd.nist.gov/vuln/detail/CVE-2025-26399

Affected Products

The following products are affected by CVE-2025-26399 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Solarwinds web_help_desk
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 CRITICAL 49f11609-934d-4621-84e6-e02e032104d6
CVSS 3.1 CRITICAL [email protected]
Solution
Update SolarWinds Web Help Desk to patch deserialization RCE.
  • Update SolarWinds Web Help Desk to the latest version.
  • Apply any available security patches from SolarWinds.
  • Monitor systems for signs of compromise.
  • Restrict access to vulnerable systems.
Public PoC/Exploit Available at Github

CVE-2025-26399 has a 6 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-26399.

URL Resource
https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_12-8-7-hotfix-1_release_notes.htm Release Notes
https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-26399 PatchVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-26399
https://www.microsoft.com/en-us/security/blog/2026/02/06/active-exploitation-solarwinds-web-help-desk/
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-26399 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-26399 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
lucacapacci/PoC-in-GitHub

Mirror of https://github.com/nomi-sec/PoC-in-GitHub

Updated: 1 month ago
0 stars 0 fork 0 watcher
Born at : Feb. 7, 2026, 10:02 a.m. This repo has been linked 789 different CVEs too.
Profile Photo
h4xnz/CVE-2025-26399-Exploit

None

Updated: 5 months, 1 week ago
1 stars 0 fork 0 watcher
Born at : Sept. 23, 2025, 4:35 p.m. This repo has been linked 3 different CVEs too.
Profile Photo
rxerium/CVE-2025-26399

Detection for CVE-2025-26399

critical nuclei solarwinds vulnerability

Updated: 4 months, 3 weeks ago
2 stars 1 fork 1 watcher
Born at : Sept. 23, 2025, 11:34 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
PuddinCat/GithubRepoSpider

监控Github最新网络安全相关的仓库...

cve cybersecurity github spider

Shell Python Nix

Updated: 5 months, 2 weeks ago
26 stars 5 fork 5 watcher
Born at : May 9, 2025, 2:29 p.m. This repo has been linked 36 different CVEs too.
Profile Photo
rxerium/stars

A list of all of my starred repos, automated using Github Actions 🌟

github-actions stars

Updated: 1 week, 2 days ago
0 stars 0 fork 0 watcher
Born at : Jan. 4, 2023, 11:20 a.m. This repo has been linked 39 different CVEs too.
Profile Photo
nomi-sec/PoC-in-GitHub

📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.

security cve exploit poc vulnerability

Updated: 22 hours, 47 minutes ago
7556 stars 1241 fork 1241 watcher
Born at : Dec. 8, 2019, 1:03 p.m. This repo has been linked 761 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-26399 vulnerability anywhere in the article.

  • TheCyberThrone
CISA KEV Catalog Update – March 9 2026

March 10, 2026CISA has added three new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog today, based on evidence of active exploitationCVE-2026-1603 — Ivanti Endpoint Manager (EPM) ... Read more

Published Date: Mar 10, 2026 (3 hours, 18 minutes ago)
  • europa.eu
Cyber Brief 26-03 - February 2026

Cyber Brief (February 2026)March 2, 2026 – Version: 1TLP:CLEARExecutive summaryWe analysed 303 open source reports for this Cyber Security Brief1.Relating to cyber policy and law enforcement, the Euro ... Read more

Published Date: Mar 02, 2026 (1 week ago)
  • The Hacker News
Researchers Observe In-the-Wild Exploitation of BeyondTrust CVSS 9.9 Vulnerability

Threat actors have started to exploit a recently disclosed critical security flaw impacting BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA) products, according to watchTowr. "Overni ... Read more

Published Date: Feb 13, 2026 (3 weeks, 3 days ago)
  • Help Net Security
Unpatched SolarWinds WHD instances under active attack

Internet‑exposed and vulnerable SolarWinds Web Help Desk (WHD) instances are under attack by threat actors looking to gain an initial foothold into target organizations’ networks, Microsoft and Huntre ... Read more

Published Date: Feb 10, 2026 (3 weeks, 6 days ago)
  • Daily CyberSecurity
Virtual Invasion: SolarWinds WHD Exploited to Host Hidden QEMU VMs

Image: Microsoft In a striking display of “living off the land” gone wrong, threat actors are turning legitimate administrative tools into stealthy backdoors. The Microsoft Defender Research Team has ... Read more

Published Date: Feb 10, 2026 (1 month ago)
  • The Register
Someone's attacking SolarWinds WHD to steal high‑privilege credentials - but we don't know who or how

Digital intruders exploited buggy SolarWinds Web Help Desk (WHD) instances in December to break into victims' IT environments, move laterally, and steal high-privilege credentials, according to Micros ... Read more

Published Date: Feb 09, 2026 (1 month ago)
  • security.nl
Microsoft meldt aanvallen op SolarWinds Help Desk-installaties

Aanvallers hebben in december aanvallen uitgevoerd tegen SolarWinds Help Desk-installaties, zo meldt Microsoft. Welke kwetsbaarheden de aanvallers daarbij gebruikten is volgens het techbedrijf onduide ... Read more

Published Date: Feb 09, 2026 (1 month ago)
  • The Hacker News
SolarWinds Web Help Desk Exploited for RCE in Multi-Stage Attacks on Exposed Servers

Microsoft has revealed that it observed a multi‑stage intrusion that involved the threat actors exploiting internet‑exposed SolarWinds Web Help Desk (WHD) instances to obtain initial access and move l ... Read more

Published Date: Feb 09, 2026 (1 month ago)
  • CybersecurityNews
Hackers Actively Exploiting SolarWinds Web Help Desk RCE Vulnerability to Deploy Custom Tools

SolarWinds Vulnerability Actively Exploited Active exploitation of a remote code execution (RCE) vulnerability in SolarWinds Web Help Desk (WHD) is accelerating, with attackers rapidly weaponizing com ... Read more

Published Date: Feb 09, 2026 (1 month ago)
  • The Hacker News
SolarWinds Fixes Four Critical Web Help Desk Flaws With Unauthenticated RCE and Auth Bypass

SolarWinds has released security updates to address multiple security vulnerabilities impacting SolarWinds Web Help Desk, including four critical vulnerabilities that could result in authentication by ... Read more

Published Date: Jan 29, 2026 (1 month, 1 week ago)
  • CybersecurityNews
Critical Solarwinds Web Vulnerability Allows Remote Code Execution and Security Bypass

Multiple critical vulnerabilities in SolarWinds Web Help Desk (WHD), culminating in unauthenticated remote code execution (RCE) via Java deserialization in CVE-2025-40551, were uncovered by Horizon3.a ... Read more

Published Date: Jan 29, 2026 (1 month, 1 week ago)
  • BleepingComputer
SolarWinds warns of critical Web Help Desk RCE, auth bypass flaws

SolarWinds has released security updates to patch critical authentication bypass and remote command execution vulnerabilities in its Web Help Desk IT help desk software. The authentication bypass secu ... Read more

Published Date: Jan 28, 2026 (1 month, 1 week ago)
  • The Cyber Express
Senators Peters and Rounds Introduce Bipartisan Bill to Restore Cybersecurity Protections

In a renewed push to safeguard America’s digital infrastructure, U.S. Senators Gary Peters (D-MI) and Mike Rounds (R-SD) have introduced the Protecting America from Cyber Threats Act — a bipartisan bi ... Read more

Published Date: Oct 10, 2025 (4 months, 3 weeks ago)
  • The Hacker News
Oracle Rushes Patch for CVE-2025-61882 After Cl0p Exploited It in Data Theft Attacks

Oct 06, 2025Ravie LakshmananVulnerability / Threat Intelligence Oracle has released an emergency update to address a critical security flaw in its E-Business Suite that it said has been exploited in ... Read more

Published Date: Oct 06, 2025 (5 months ago)
  • The Hacker News
Scanning Activity on Palo Alto Networks Portals Jump 500% in One Day

Oct 04, 2025Ravie LakshmananVulnerability / Network Security Threat intelligence firm GreyNoise disclosed on Friday that it has observed a spike in scanning activity targeting Palo Alto Networks log ... Read more

Published Date: Oct 04, 2025 (5 months ago)
  • The Hacker News
CISA Flags Meteobridge CVE-2025-4008 Flaw as Actively Exploited in the Wild

Oct 03, 2025Ravie LakshmananVulnerability / IoT Security The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Thursday added a high-severity security flaw impacting Smartbedded Meteob ... Read more

Published Date: Oct 03, 2025 (5 months ago)
  • The Hacker News
ThreatsDay Bulletin: CarPlay Exploit, BYOVD Tactics, SQL C2 Attacks, iCloud Backdoor Demand & More

From unpatched cars to hijacked clouds, this week's Threatsday headlines remind us of one thing — no corner of technology is safe. Attackers are scanning firewalls for critical flaws, bending vulnerab ... Read more

Published Date: Oct 02, 2025 (5 months, 1 week ago)
  • The Hacker News
OneLogin Bug Let Attackers Use API Keys to Steal OIDC Secrets and Impersonate Apps

Oct 01, 2025Ravie LakshmananVulnerability / API Security A high-severity security flaw has been disclosed in the One Identity OneLogin Identity and Access Management (IAM) solution that, if successf ... Read more

Published Date: Oct 01, 2025 (5 months, 1 week ago)
  • The Hacker News
Red Hat OpenShift AI Flaw Exposes Hybrid Cloud Infrastructure to Full Takeover

Oct 01, 2025Ravie LakshmananAI Security / Cloud Security A severe security flaw has been disclosed in the Red Hat OpenShift AI service that could allow attackers to escalate privileges and take cont ... Read more

Published Date: Oct 01, 2025 (5 months, 1 week ago)
  • The Hacker News
Hackers Exploit Milesight Routers to Send Phishing SMS to European Users

Oct 01, 2025Ravie LakshmananVulnerability / Malware Unknown threat actors are abusing Milesight industrial cellular routers to send SMS messages as part of a smishing campaign targeting users in Eur ... Read more

Published Date: Oct 01, 2025 (5 months, 1 week ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-26399 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Mar. 09, 2026

    Action Type Old Value New Value
    Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-26399
    Added Reference https://www.microsoft.com/en-us/security/blog/2026/02/06/active-exploitation-solarwinds-web-help-desk/
  • Initial Analysis by [email protected]

    Nov. 14, 2025

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:solarwinds:web_help_desk:*:*:*:*:*:*:*:* versions up to (including) 12.8.6 *cpe:2.3:a:solarwinds:web_help_desk:12.8.7:-:*:*:*:*:*:*
    Added Reference Type SolarWinds: https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_12-8-7-hotfix-1_release_notes.htm Types: Release Notes
    Added Reference Type SolarWinds: https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-26399 Types: Patch, Vendor Advisory
  • New CVE Received by [email protected]

    Sep. 23, 2025

    Action Type Old Value New Value
    Added Description SolarWinds Web Help Desk was found to be susceptible to an unauthenticated AjaxProxy deserialization remote code execution vulnerability that, if exploited, would allow an attacker to run commands on the host machine. This vulnerability is a patch bypass of CVE-2024-28988, which in turn is a patch bypass of CVE-2024-28986.
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-502
    Added Reference https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_12-8-7-hotfix-1_release_notes.htm
    Added Reference https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-26399
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 9.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact