CVE-2025-34291

Name: CVE-2025-34291
Creator: NVD / NIST
Published: 2025-12-05T23:15:47.433+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.4/10Actively ExploitedEPSS 78.89%

Last modified Jun 17, 2026

CVE-2025-34291 is a critical-severity vulnerability rated 9.4/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 78.89% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0

9.4/10

CVSS:4.0/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

EPSS Probability

78.89%

99.5th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Jun 4, 2026.

Weakness Enumeration

CWE-346

Affected Software

Vendor	Product	Versions
Langflow	Langflow	<= 1.6.9

References

https://github.com/langflow-ai/langflowProduct
https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platformExploit, Mitigation, Third Party Advisory
https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rceThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291US Government Resource
https://www.crowdsec.net/vulntracking-report/cve-2025-34291Third Party Advisory

Timeline

Published: Dec 5, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-34291?

How severe is CVE-2025-34291?

CVE-2025-34291 has a CVSS score of 9.4/10 (CRITICAL severity). The EPSS model estimates a 78.89% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2025-34291?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-34291?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST