CVE-2025-34291
CORS misconfig enables token theft and RCE in Langflow ≤1.6.9
Is CVE-2025-34291 being exploited?
Yes. CVE-2025-34291 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2025-34291?
CVE-2025-34291 is rated Critical with a CVSS score of 9.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2025-34291?
Yes. A fix has been recorded for CVE-2025-34291. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-34291 affect?
CVE-2025-34291 affects Langflow. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2025-34291?
Patch to 1.9.3+ or apply vendor mitigations.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker can steal access/refresh tokens via cross-origin requests, enabling arbitrary code execution and full compromise.
Immediate action required
- affected<= 1.6.9
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.