CVE-2025-34291
Langflow Origin Validation Error Vulnerability - [Actively Exploited]
Description
Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.
INFO
Published Date :
Dec. 5, 2025, 11:15 p.m.
Last Modified :
May 21, 2026, 8:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
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.
Langflow contains an origin validation error vulnerability in which an overly permissive CORS configuration combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. This could allow the attacker to execute arbitrary code and achieve full system compromise via obtained tokens that permit access to authenticated endpoints.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Unknown
This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/langflow-ai/langflow ; https://github.com/langflow-ai/langflow/releases/tag/v1.9.3; https://github.com/langflow-ai/langflow/issues/11465#event-25774545848 ; https://nvd.nist.gov/vuln/detail/CVE-2025-34291
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | CRITICAL | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update Langflow to version 1.7.0 or later.
- Restrict CORS configuration to known origins.
- Set SameSite attribute for session cookies appropriately.
- Review and harden all security configurations.
Public PoC/Exploit Available at Github
CVE-2025-34291 has a 12 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-2025-34291.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-34291 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-2025-34291
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).
Langflow Origin Validation Error / CORS Misconfiguration Scanner
Python
Actively exploited CVE scanners from CISA KEV + Twitter trends - Drupal SQLi, PAN-OS RCE, Android ADBD, GHE RCE, BeyondTrust, Defender, and more
Python
A lightweight Python-based security assessment tool for detecting dangerous Cross-Origin Resource Sharing (CORS) misconfigurations - CVE-2025-34291.
Python
A curated timeline of real AI agent security incidents, breaches, and vulnerabilities (2024-2026). Every entry sourced and dated.
ai-agent-security ai-agents ai-security awesome-list cybersecurity llm-security mcp-security prompt-injection supply-chain-security adversarial-attacks agent-security agentic-ai ai-attacks ai-safety cve incident-response owasp red-team security-research vulnerability
A curated corpus of incidents, attack vectors, failure modes, and defensive tools for autonomous AI agents.
agent-skills ai ai-agents claude claude-code codex llm openclaw prompt-injection security vibe-coding ai-security llm-security
Coyote Security - Open Source security scanner for Github repos and AI Agents.
Shell Python
Autonomous AI agents are starting to act on our behalf — making purchases, executing workflows, negotiating with other agents. As this shift accelerates, verifiable identity becomes a foundational requirement.
None
这是一个每天同步Vulnerability-Wiki中docs-base中内容的项目
HTML
None
HTML
一个 CVE 漏洞预警知识库，无 exp/poc，部分包含修复方案。A knowledge base of CVE security vulnerability, no PoCs/exploits.
一个漏洞 PoC 知识库。A knowledge base for vulnerability PoCs(Proof of Concept), with 1k+ vulnerabilities.
poc
Dockerfile Java Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-34291 vulnerability anywhere in the article.
-
CybersecurityNews
CISA adds Langflow Origin Validation Flaw to Known Exploited Vulnerabilities Catalog
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a critical Langflow vulnerability, tracked as CVE-2025-34291, to its Known Exploited Vulnerabilities (KEV) Catalog, signaling ... Read more
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TheCyberThrone
CISA adds Langflow and Trend Micro Apex One to KEV
May 22, 2026CVE-2025-34291 — Langflow Origin Validation Error (RCE)CVSS: 9.4CWE: CWE-346 — Origin Validation ErrorAffected Versions: Langflow ≤ 1.6.9Vulnerability SummaryResearchers at Obsidian Securi ... Read more
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The Hacker News
CISA Adds Exploited Langflow and Trend Micro Apex One Vulnerabilities to KEV
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Thursday added two security flaws impacting Langflow and Trend Micro Apex One to its Known Exploited Vulnerabilities (KEV) catalog, ... Read more
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CybersecurityNews
MuddyWater-Style Hackers Scan 12,000+ Systems Before Hitting Middle East Critical Sectors
A sophisticated cyber campaign bearing strong operational similarities to the MuddyWater threat group has been caught sweeping more than 12,000 internet-exposed systems across multiple regions before ... Read more
The following table lists the changes that have been made to the
CVE-2025-34291 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.
-
Modified Analysis by [email protected]
May. 22, 2026
Action Type Old Value New Value Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291 Types: US Government Resource Added Reference Type CISA-ADP: https://www.crowdsec.net/vulntracking-report/cve-2025-34291 Types: Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 21, 2026
Action Type Old Value New Value Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291 Added Reference https://www.crowdsec.net/vulntracking-report/cve-2025-34291 -
CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725
May. 21, 2026
Action Type Old Value New Value Added Date Added 2026-05-21 Added Due Date 2026-05-21 Added Required Action 2026-05-21 Added Vulnerability Name 2026-05-21 -
Initial Analysis by [email protected]
Jan. 16, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:* versions up to (including) 1.6.9 Added Reference Type VulnCheck: https://github.com/langflow-ai/langflow Types: Product Added Reference Type VulnCheck: https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform Types: Exploit, Mitigation, Third Party Advisory Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce Types: Third Party Advisory -
New CVE Received by [email protected]
Dec. 05, 2025
Action Type Old Value New Value Added Description Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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-346 Added Reference https://github.com/langflow-ai/langflow Added Reference https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform Added Reference https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce