Quick answers
- Is CVE-2026-82290 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-82290 being exploited in the wild.
- How severe is CVE-2026-82290?
- Medium severity, with a CVSS score of 5.3, published 28 August 2026.
- Which products and versions are affected?
- Chainlit through 2.12.0.
- Is there a fix for CVE-2026-82290?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-82290 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-82290?
- Check whether you run Chainlit at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
Chainlit versions through 2.12.0 lack proper ownership validation in the PUT and DELETE endpoints that handle feedback records. The vulnerability is an authorization bypass: while authentication is required to access these endpoints, the application does not verify that the authenticated user is the owner of the feedback record they are modifying or deleting. An attacker with valid credentials can supply arbitrary feedback identifiers to alter or remove feedback belonging to other users, corrupting evaluation datasets. The fix requires adding ownership checks before allowing modifications to feedback records.
Affected products
- Chainlit Chainlit through 2.12.0
Timeline
- 2026-08-28: disclosed