Exploited CVEs / Langflow / CVE-2025-34291
CVE-2025-34291
Langflow Origin Validation Error Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2026-06-04 (that deadline has passed); treat that date as the outer bound for your own environment. Check the vendor security advisory for the fix.
Actively exploited Langflow vulnerability, High severity, CVSS 8.8. Added to the CISA KEV catalog 2026-05-21.
Risk summary
Updated August 1, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2025-34291
Langflow's overly permissive CORS configuration, combined with a refresh token cookie set to SameSite=None, lets a malicious webpage make credentialed cross-origin calls into the server from a victim's browser. It is rated High Severity at CVSS 8.8 with a 79% EPSS score, confirmed exploited since 2026-05-21. Together with the code injection flaw also in the KEV catalog, it gives attackers both a browser-borne and a direct route into Langflow deployments.
Do this: Upgrade Langflow and tighten its CORS and cookie settings so browser sessions cannot be ridden from arbitrary sites.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2025-34291
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2025-34291
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2026-06-04 (past due).
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Official fix for CVE-2025-34291
Check the vendor's security advisory channel for the patched Langflow versions and workarounds.
Common questions about CVE-2025-34291
Is CVE-2025-34291 actively exploited?
Yes. CVE-2025-34291 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2026-05-21, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 84%.
What is the CISA deadline and required action for CVE-2025-34291?
CISA set the federal (BOD 22-01) remediation due date at 2026-06-04, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
What fixes CVE-2025-34291?
Check the vendor's security advisory for the patched Langflow versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2025-34291?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2025-34291's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
More exploited Langflow CVEs
The newest Langflow entries on the CISA KEV catalog:
All Langflow exploited CVEs on one page: Langflow vulnerabilities actively exploited.
Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
