CVE-2026-55255

Langflow LangflowActively Exploited (CISA KEV)CVSS 9.9KEV0-Day

Actively exploited (CISA KEV) - patch before 2026-07-10

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.

Actively exploited in the wild and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No distribution fix is listed yet; apply vendor mitigations and monitor.

Recommended action: No fix is published yet for an actively-exploited flaw. Apply vendor mitigations, restrict exposure, and watch for a patch.

CVE-2026-55255 Langflow Langflow Actively Exploited (CISA KEV)

Severity metrics

CVSS 3.1 : 9.9 CRITICAL

Attack vectorNetwork (remote)

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeChanged

Confidentiality impactHigh

Integrity impactHigh

Availability impactLow

Vector: AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

Affected & fixed versions by distribution

Versions are the native distribution strings (backport-aware): RHEL/Debian/SUSE backport fixes, so compare with the distro version comparator (dpkg / rpm / vercmp), not the upstream version.

No affected package in the tracked watchlist yet (Debian, Ubuntu, Arch, SUSE, Red Hat...). Triage may still be pending.

Sources

Advisory NVD CVE.org

Published 2026-07-07 · source: CISA Known Exploited Vulnerabilities