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Exploited vulnerability · CISA KEV

Is CVE-2025-34291 exploited? Yes: in CISA KEV since 21 May 2026

Gociux · Langflow · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-34291, Langflow Origin Validation Error Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 21 May 2026, 167 days after it was published. It affects Langflow. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 21 May 2026
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.4CVSS 4.0 · critical
US federal due4 Jun 2026BOD 22-01 deadline

What it is

Langflow contains an origin validation error vulnerability in which an overly permissive CORS configuration 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. This could allow the attacker to execute arbitrary code and achieve full system compromise via obtained tokens that permit access to authenticated endpoints.

VendorLangflow (5 exploited CVEs in KEV)
ProductLangflow
VulnerabilityLangflow Origin Validation Error Vulnerability
WeaknessCWE-346
Published5 Dec 2025
Added to KEV21 May 2026
Reported by (CNA)VulnCheck

What to do

  1. Check whether you run it. Look for Langflow in your asset inventory, including appliances and cloud images. Stack check lists every exploited Langflow CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 5 Dec 2025.
  4. Get told next time. Email alerts when CISA adds a CVE for Langflow.

Other exploited CVEs in Langflow

References

Questions

Is CVE-2025-34291 being exploited?

Yes. CISA added CVE-2025-34291 to the Known Exploited Vulnerabilities catalog on 21 May 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2025-34291 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2025-34291?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Langflow's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Langflow and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in May 2026 · Langflow scorecard · act-now radar.

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