Medium severity · published Aug 28, 2026
CVE-2026-82290
Chainlit Feedback Endpoints Missing Ownership Validation
5.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CH
chainlit · Chainlit
through 2.12.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-82290
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-82290
github.com
https://github.com/Chainlit/chainlit
github.com
https://github.com/Chainlit/chainlit/blob/190ea74239d9e84b26e7c91bc2882dd038942564/backend/chainlit/server.py
github.com
https://github.com/Chainlit/chainlit/issues/2975
www.vulncheck.com
https://www.vulncheck.com/advisories/chainlit-feedback-endpoints-missing-ownership-validation
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