CVE-2026-55255 — newly added to CISA KEV

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 v

01What CISA says about this vulnerability

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.

02Required action — verbatim from CISA

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

03Notes & references

• github.com — https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625…
• github.com — https://github.com/langflow-ai/langflow/pull/12832
• github.com — https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2
• github.com — https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2
• webflow.sysdig.com — https://webflow.sysdig.com/blog/understanding-langflow-cve-2026-55255-and-why-hi…
• www.cisa.gov — https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-…

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

No structured affected-product list available — see references below for vendor advisories.

06Detection

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