CVE-2025-34291

critical

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.

References

https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce

https://thehackernews.com/2026/07/cisa-adds-4-actively-exploited-adobe.html

https://thehackernews.com/2026/07/iran-linked-hackers-use-new-cavern-c2.html

https://thehackernews.com/2026/06/unpatched-langflow-flaw-cve-2026-5027.html

https://thehackernews.com/2026/05/cisa-adds-exploited-langflow-and-trend.html

https://securityaffairs.com/192529/hacking/u-s-cisa-adds-trend-micro-apex-one-and-langflow-to-its-known-exploited-vulnerabilities-catalog.html

https://www.cisa.gov/news-events/alerts/2026/05/21/cisa-adds-two-known-exploited-vulnerabilities-catalog

https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform

https://www.crowdsec.net/vulntracking-report/cve-2025-34291

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291

https://github.com/langflow-ai/langflow

Details

Source: Mitre, NVD

Published: 2025-12-05

Updated: 2026-05-21

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8.8

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

Severity: High

CVSS v4

Base Score: 9.4

Vector: 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

Severity: Critical

EPSS

EPSS: 0.7889