CVE-2026-8505 json
Authentication Bypass in Webhook Endpoints Allowed Unauthorized Flow Execution
published 2026-07-17 3 mo ago modified 2026-10-24 15 d ago also GHSA-cf6m-vc3m-7cgm , PYSEC-2026-4233 , EUVD-2026-45272
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 59%
- public exploits
- 0
- none known
Summary
IBM Langflow OSS 1.0.0 through 1.10.0 has a vulnerability in Langflow's webhook authentication logic allows unauthenticated users to trigger the execution of any flow. The system incorrectly bypasses API key validation when the WEBHOOK_AUTH_ENABLE configuration is set to False (which is the default setting). This allows a remote attacker who knows a flow's UUID to execute it as if they were the owner, potentially leading to Remote Code Execution (RCE).
Patch / fix
- pypi langflow 1.9.1
- langflow langflow 1.10.1
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 3 mo ago
Exploit prediction
0.87% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| OSV | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | langflow | >=1.7.0, <1.9.1 |
1.9.1 |
Affected products
- IBM Langflow OSS
Classification
- Weakness
-
- CWE-306 Missing Authentication for Critical Functionality
References
-
ibm.com
/support/pages/node/7278921
vendor-advisory, patch, web
-
github.com
/langflow-ai/langflow/pull/12845
web
-
github.com
/langflow-ai/langflow/commit/cb6f7508dda83ead9c3e4417e96e4b5bd9a260c3
web
-
github.com
/langflow-ai/langflow/security/advisories/GHSA-cf6m-vc3m-7cgm
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-8505
advisory
-
github.com
/langflow-ai/langflow
package
-
github.com
/langflow-ai/langflow/releases/tag/v1.9.1
web
-
pypi.org
/project/langflow
package
-
github.com
/advisories/GHSA-cf6m-vc3m-7cgm
advisory
Sources
- CVE List CVE-2026-8505
- GitHub Advisory GHSA-cf6m-vc3m-7cgm
- NVD CVE-2026-8505
- OSV PYSEC-2026-4233
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