What is CVE-2026-82290?

CVE-2026-82290 is a medium-severity vulnerability in Chainlit, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.3/10. Published 2026-08-28.

How severe is CVE-2026-82290?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in Chainlit

CVE-2026-82290

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.

Vulnerability class: IDOR (Insecure Direct Object Reference)

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Chainlit

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-82290?: CVE-2026-82290 is a medium-severity vulnerability in Chainlit, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.3/10. Published 2026-08-28.
How severe is CVE-2026-82290?: Medium severity. CVSS v3 base score is 5.3 out of 10.