CVE-2026-55255 Exploited in the wild
Langflow Authorization Bypass Through User-Controlled Key Vulnerability
- Risk score
- 80/100
- CVSS
- 8.4 v3.1
- Published
- 23 Jun 2026
- Added to CISA's exploited list
- 7 Jul 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, an Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request. This vu…
- Affected
- Langflow before 1.9.1
- Fix
- Upgrade Langflow to 1.9.1 or later.
- Exploitation
- Exploited in the wild
Story map
At a glance
Langflow: Red, act today. IBM Langflow OSS 1.0.0 through 1.12.2 could allow a remote attacker to execute arbitrary code due to improper neutralization of special elements used in an OS command.
The flaws
- CVE-2026-55255: Langflow Authorization Bypass Through User-Controlled Key Vulnerability (CVSS 8.4 · exploited)
- CVE-2026-93674: Code injection can lead to remote code execution (CVSS 9.8 · EPSS 15%)
- CVE-2026-10561: Langflow: PythonREPLComponent executes unsandboxed Python code, enabling authenticated RCE and privilege escalation (CVSS 10.0 · EPSS 1%)
- CVE-2026-8505: Langflow: Unauthenticated Flow Execution via Webhook Authentication Bypass (CVSS 9.8 · EPSS 1%)
The fix
Upgrade Langflow: 1.9.1 or later on your release line
Who is exposed: Langflow
Where it stands
- Exploited in the wild
- On CISA's exploited list since 7 Jul
- US federal deadline 10 Jul
How it unfolded
- 7 Jul, CISA (official): Added to the Known Exploited Vulnerabilities list
- 10 Jul, Deadline (official): US federal agencies must have patched
Connects to
- Same weakness: Authorisation bypass (CWE-639). 272 other warnings in 30 days
- Same product: Earlier Langflow warnings. 57 in the last 90 days
Why it is Red
- CVSS 8.4 high
- Exploited in the wild (CISA KEV)
- Public exploit or proof of concept referenced
CISA required action
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.
References
- https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e
- https://github.com/langflow-ai/langflow/pull/12832
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2
- https://webflow.sysdig.com/blog/understanding-langflow-cve-2026-55255-and-why-higher-cvss-vulnerabilities-arent-always-the-most-exploited
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55255
Original description
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, an Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request. This vulnerability is fixed in 1.9.1.
Last activity 7 Jul 2026. Patch Forecast updates every hour.