Insecure Direct Object Reference in Langflow (CVE‑2026‑55255) Enables Credential Harvesting
What It Is — An IDOR flaw in Langflow’s /api/v1/responses endpoint allows an authenticated attacker to invoke any other user’s flow by supplying its ID. The endpoint fails to verify ownership, letting the attacker run the victim’s workflow and capture embedded secrets.
Exploitability — Actively exploited in the wild since late June 2026; CISA added it to the Known Exploited Vulnerabilities catalog. No public PoC is required beyond a valid authentication token.
Affected Products — Langflow versions < 1.9.2 (open‑source visual AI‑agent framework).
Why It Matters for Compliance & Audit Readiness
- SOC 2 Access Controls – The flaw bypasses logical access restrictions, violating CC6.1 (Logical Access) and CC6.2 (User Access Management).
- Evidence of Due Diligence – Continuous monitoring for unauthorized flow executions provides audit‑ready proof that access controls are enforced.
- Defensible Audit Trail – Mapping the IDOR to a control gap and documenting remediation (patches, secret rotation) satisfies auditors’ demand for documented remediation actions.
Recommended Actions
- Upgrade all Langflow deployments to ≥ 1.9.2 immediately.
- Rotate any API keys, cloud credentials, or database secrets embedded in existing flows.
- Enforce strict tenant isolation checks at the application layer; add logging for flow‑execution requests.
- Incorporate the IDOR remediation into your SOC 2 access‑control policy and capture evidence of the patch rollout.
- Monitor for anomalous flow‑execution patterns using a SIEM or continuous compliance platform.
Source: Help Net Security – Attackers using Langflow flaw for credential harvesting (CVE‑2026‑55255)