CVE-2026-55255
Actively exploited. CVE-2026-55255 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-07-07) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2026-55255 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
Serial number: AV26-670 Date: July 8, 2026 On July 7, 2026, Langflow updated a security advisory to address vulnerabilities in the following product: Langflow – versions prior to 1.9.1 On July 7, 2026, Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2026-55255 to their Known Exploited Vulnerabilities (KEV) Database. The Cyber Centre encourages users and administrators to review the provided web links and apply the necessary updates, when available. CVE-2026-55255: Langflow: IDOR Vulnerability in /api/v1/responses Endpoint Allows Authenticated Attackers to Access Another User's Flow CISA KEV: CVE-2026-55255
CSIRTS triage
- What
- An IDOR vulnerability in the `/api/v1/responses` endpoint allows authenticated attackers to access another user's flow.
- Who is affected
- Authenticated users of Langflow versions prior to 1.9.1.
- Urgency
- Remediation is urgent as the vulnerability is actively exploited.
- Action
- Users should update to Langflow version 1.9.1 or later.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 37% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2026-55255 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (5)
- unknownexploitedLangflow security advisory (AV26-670)cccs · 2026-07-08
- high[UPDATE] [high] Langflow: Multiple vulnerabilitiescert-bund · 2026-07-08
- highexploitedCISA Adds Three Known Exploited Vulnerabilities to Catalogcisa · 2026-07-07
- criticalexploitedCVE-2026-55255: Langflow Authorization Bypass Through User-Controlled Key Vulnerabilitycisa-kev · 2026-07-07
- highexploitedGHSA-qrpv-q767-xqq2: Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attacke…ghsa · 2026-06-19
External references
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[](https://www.csirts.com/cve/CVE-2026-55255)