---
id: CVE-2026-82290
title: >-
  Chainlit through 2.12.0 fails to validate ownership of feedback records in PUT
  and DELETE endpoints
summary: >-
  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 …
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-639
published: '2026-08-28'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T13:42:44.520'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82290'
references:
  - url: 'https://github.com/Chainlit/chainlit'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/Chainlit/chainlit/blob/190ea74239d9e84b26e7c91bc2882dd038942564/backend/chainlit/server.py
    label: disclosure@vulncheck.com
  - url: 'https://github.com/Chainlit/chainlit/issues/2975'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/chainlit-feedback-endpoints-missing-ownership-validation
    label: disclosure@vulncheck.com
  - url: 'https://github.com/Chainlit/chainlit/issues/2975'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.0034
epssPercentile: 0.24644
ingestedAt: '2026-09-16T13:56:12.599Z'
vendor: Chainlit
product: chainlit
affected:
  - chainlit <= 2.12.0
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-31T18:50:22.987777Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.