Vulnerability · Published Aug 28, 2026 · Assigned by VulnCheck
CVE-2026-82290Chainlit Feedback Endpoints Missing Ownership Validation
Medium 5.3
In plain English
A medium-severity authorization bypass via user-controlled key in chainlit from Chainlit. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.3%top 72.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Chainlit through 2.12.0 fails to validate ownership of feedback records in PUT and DELETE endpoints. Authenticated attackers can delete or modify other users' feedback by supplying arbitrary feedback identifiers, corrupting human-rating data used for model evaluation.
Affected products (as reported)
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
References
- GitHub Issue #2975 issue-tracking
- https://github.com/Chainlit/chainlit product
- Vulnerable code: server.py technical-description
- VulnCheck Advisory: Chainlit Feedback Endpoints Missing Ownership Validation third-party-advisory