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PatchSiren cyber security CVE debrief

CVE-2026-8505 IBM CVE debrief

IBM Langflow OSS 1.0.0 through 1.10.0 has a critical vulnerability in its webhook authentication logic, allowing unauthenticated users to trigger the execution of any flow when WEBHOOK_AUTH_ENABLE is set to False (the default setting). This could lead to Remote Code Execution (RCE) if an attacker knows a flow's UUID. The vulnerability has a CVSS score of 9.8 and is considered CRITICAL. Defenders of IBM Langflow OSS installations should assess and mitigate this vulnerability promptly.

Vendor
IBM
Product
Langflow OSS
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-17
Original CVE updated
2026-07-18
Advisory published
2026-07-17
Advisory updated
2026-07-18

Who should care

Defenders of IBM Langflow OSS installations, security teams, and operators responsible for the platform should assess and mitigate this vulnerability. The vulnerability's high CVSS score and potential for Remote Code Execution (RCE) make it a high-priority issue. Security teams should review the configuration of WEBHOOK_AUTH_ENABLE and consider enabling authentication to prevent exploitation.

Technical summary

The vulnerability in IBM Langflow OSS 1.0.0 through 1.10.0 is caused by a flaw in the webhook authentication logic. When the WEBHOOK_AUTH_ENABLE configuration is set to False (which is the default setting), unauthenticated users can trigger the execution of any flow by knowing its UUID. This could potentially lead to Remote Code Execution (RCE). The CVSS score for this vulnerability is 9.8, indicating a high severity. Affected installations should be identified and mitigated as soon as possible.

Defensive priority

High priority due to CVSS score of 9.8 and potential for RCE.

Recommended defensive actions

  • Inventory and assess IBM Langflow OSS installations for exposure.
  • Verify WEBHOOK_AUTH_ENABLE configuration and consider enabling authentication.
  • Restrict access to flow UUIDs and implement compensating controls.
  • Monitor for suspicious flow execution activity.
  • Apply vendor remediation when available.
  • Review and update incident response plans to include this vulnerability.
  • Conduct regular security audits to identify and address similar vulnerabilities.

Evidence notes

Evidence from official CVE and NVD sources indicates a critical vulnerability exists in IBM Langflow OSS, with limited details on affected scope and vendor remediation status. Defenders should verify the WEBHOOK_AUTH_ENABLE configuration and assess potential exposure. The CVE record was published on 2026-07-17T20:17:31.417Z and has not been modified since then. Additional review of IBM support pages and related advisories is recommended to understand the full impact and mitigation strategies.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-17T20:17:31.417Z and has not been modified since then.