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HIGH CISA KEV

CVE-2025-34291

CVSS v3

8.8

HIGH

EPSS Score

92.8 %

exploit probability, as of 2026-10-03

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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.

CISA Known Exploited Vulnerability

Date Added
2026-05-21
Patch Due Date
2026-06-04
Ransomware Use
Unknown

Technical details

Published
2025-12-05

Frequently asked questions

What is CVE-2025-34291?

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.

Is CVE-2025-34291 actively exploited?

Yes. CVE-2025-34291 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-06-04.

What is the CVSS score for CVE-2025-34291?

CVE-2025-34291 has a CVSS v3 base score of 8.8 (HIGH severity).

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