Open WebUI: Mass Assignment via FeedbackForm extra=allow Allows Feedback User ID Spoofing and Evaluation Data Manipulation
Published May 15, 2026
5.4
MEDIUMCVSS 3.1
EPSS 0.36%
Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, the POST /api/v1/evaluations/feedback endpoint in Open WebUI v0.9.2 is vulnerable to mass assignment via FeedbackForm, which uses model_config = ConfigDict(extra='allow'). Due to an insecure dictionary merge order in insert_new_feedback(), an authenticated attacker can inject a user_id field in the request body that overwrites the server-derived value, creating feedback records attributed to any arbitrary user. This corrupts the model evaluation leaderboard (Elo ratings) and enables identity spoofing. This vulnerability is fixed in 0.9.5.
Affected products
-
- Version < 0.9.5StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Open-Webui | Open-Webui | n/a |
|
- < 0.9.5
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
References (5)
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30630 Advisory
- https://github.com/advisories/GHSA-rjmp-vjf2-qf4g Advisory
- https://github.com/open-webui/open-webui/releases/tag/v0.9.5
- https://github.com/open-webui/open-webui/security/advisories/GHSA-rjmp-vjf2-qf4g exploitx_refsource_CONFIRMVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-45396
| Link | Providers | Tags |
|---|---|---|
| https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30630 | Advisory | |
| https://github.com/advisories/GHSA-rjmp-vjf2-qf4g | Advisory | |
| https://github.com/open-webui/open-webui/releases/tag/v0.9.5 | ||
| https://github.com/open-webui/open-webui/security/advisories/GHSA-rjmp-vjf2-qf4g | exploitx_refsource_CONFIRMVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-45396 |
Change history (0)
No recorded changes yet.