Auth bypass in Langfuse
CVE-2026-24055
Langfuse is an open source large language model engineering platform. In versions 3.146.0 and below, the /api/public/slack/install endpoint initiates Slack OAuth using a projectId provided by the client without authentication or authorizat…
EPSS: 0.004 (32.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Langfuse — versions >= 3.89.0, < 3.147.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory, Mitigation)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
- security-advisories@github.com (Product, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-24055?
- CVE-2026-24055 is a medium-severity vulnerability in Langfuse, classified under Improper Access Control. CVSS score: 5.3/10. Published 2026-01-22.
- How severe is CVE-2026-24055?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2026-24055 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.