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8.7
HIGH CVSS 4.0
CVE-2026-88817
Privilege escalation via legacy access group creation endpoint
Overview
Description

An authenticated, non-guest user of Curiosity Workspace could enroll themselves as an administrator and member of an existing access group without an invitation or approval. It did not grant application-wide administrator privileges, and the vulnerability could not be used to obtain root access to the application or its underlying host.

Details
INFO

Published Date :

Sept. 16, 2026, 1:18 p.m.

Last Modified :

Sept. 23, 2026, 11:10 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-88817 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.

No affected product recoded yet

: Total Affected Vendor : 0 | Products : 0
Scoring
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 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 4.0 HIGH 24a3c815-5f22-4d74-967a-30958d6466f4
CVSS 4.0 HIGH [email protected]
Solution
Enforce proper authorization checks for user enrollment into access groups.
  • Validate user roles before granting administrator privileges.
  • Implement checks for existing group membership.
  • Require invitations or approvals for group enrollment.
  • Review access control mechanisms.
References
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-2026-88817.

URL Resource
https://docs.curiosity.ai/security/advisories/cve-2026-88817
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-88817 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-2026-88817 weaknesses.

CAPEC-58: Restful Privilege Elevation Restful Privilege Elevation CAPEC-122: Privilege Abuse Privilege Abuse CAPEC-233: Privilege Escalation Privilege Escalation CAPEC-19: Embedding Scripts within Scripts Embedding Scripts within Scripts CAPEC-441: Malicious Logic Insertion Malicious Logic Insertion CAPEC-478: Modification of Windows Service Configuration Modification of Windows Service Configuration CAPEC-479: Malicious Root Certificate Malicious Root Certificate CAPEC-502: Intent Spoof Intent Spoof CAPEC-503: WebView Exposure WebView Exposure CAPEC-536: Data Injected During Configuration Data Injected During Configuration CAPEC-546: Incomplete Data Deletion in a Multi-Tenant Environment Incomplete Data Deletion in a Multi-Tenant Environment CAPEC-550: Install New Service Install New Service CAPEC-551: Modify Existing Service Modify Existing Service CAPEC-552: Install Rootkit Install Rootkit CAPEC-556: Replace File Extension Handlers Replace File Extension Handlers CAPEC-558: Replace Trusted Executable Replace Trusted Executable CAPEC-562: Modify Shared File Modify Shared File CAPEC-563: Add Malicious File to Shared Webroot Add Malicious File to Shared Webroot CAPEC-564: Run Software at Logon Run Software at Logon CAPEC-578: Disable Security Software Disable Security Software

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).

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

The following list is the news that have been mention CVE-2026-88817 vulnerability anywhere in the article.

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-2026-88817 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 Translated by [email protected]

    Sep. 23, 2026

    Action Type Old Value New Value
    Added Translation Title: Curiosity Workspace de Curiosity GmbH, Description: Un usuario autenticado y no invitado de Curiosity Workspace podría inscribirse como administrador y miembro de un grupo de acceso existente sin una invitación o aprobación. No otorgaba privilegios de administrador a nivel de aplicación, y la vulnerabilidad no podía ser utilizada para obtener acceso root a la aplicación o a su host subyacente.
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 16, 2026

    Action Type Old Value New Value
    Added SSVC {'id': 'CVE-2026-88817', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-16T13:11:20.243964Z'}
  • New CVE Received by [email protected]

    Sep. 16, 2026

    Action Type Old Value New Value
    Added Description An authenticated, non-guest user of Curiosity Workspace could enroll themselves as an administrator and member of an existing access group without an invitation or approval. It did not grant application-wide administrator privileges, and the vulnerability could not be used to obtain root access to the application or its underlying host.
    Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
    Added CWE CWE-284
    Added CWE CWE-269
    Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/88xxx/CVE-2026-88817.json">CVE-2026-88817</a>
    Added Reference https://docs.curiosity.ai/security/advisories/cve-2026-88817
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.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 8.7
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability