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Exploited vulnerability · CISA KEV

Is CVE-2026-55255 exploited? Yes: in CISA KEV since 7 Jul 2026

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

Yes. CVE-2026-55255, Langflow Authorization Bypass Through User-Controlled Key Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 7 Jul 2026, 14 days after it was published. It affects Langflow. If you run it, CISA's required action is: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

exploitedYesCISA KEV · 7 Jul 2026
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity8.4CVSS 3.1 · high
US federal due10 Jul 2026BOD 22-01 deadline

What it is

Langflow contains an authorization bypass through user-controlled key vulnerability which allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request.

VendorLangflow (5 exploited CVEs in KEV)
ProductLangflow
VulnerabilityLangflow Authorization Bypass Through User-Controlled Key Vulnerability
WeaknessCWE-639
Published23 Jun 2026
Added to KEV7 Jul 2026
Reported by (CNA)GitHub_M

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 in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
  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 23 Jun 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for Langflow.

Other exploited CVEs in Langflow

References

Questions

Is CVE-2026-55255 being exploited?

Yes. CISA added CVE-2026-55255 to the Known Exploited Vulnerabilities catalog on 7 Jul 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-55255 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-2026-55255?

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. 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 July 2026 · Langflow scorecard · act-now radar.

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