Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.5.0 until 0.11.0, the standard channel message update and delete handlers accepted any caller holding write access on the channel without checking that the caller wrote the message. Because write access is the same grant a member needs to post, any ordinary participant in a shared standard channel could rewrite or permanently delete another participant message, while group and direct message handlers enforced authorship. This issue is fixed in 0.11.0.
Affected products
openwebui: open webui
References4
- github.com/open-webui/open-webui/pull/27197 PatchVendor Advisory
- github.com/open-webui/open-webui/security/advisories/GHSA-mj5r-… ExploitPatchVendor Advisory
- github.com/open-webui/open-webui/commit/c609ec41154fa092fa0af80… Patch
- github.com/open-webui/open-webui/releases/tag/v0.11.0 Release Notes
Metrics
- CVSS 3.1
-
5.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L - EPSS — exploit probability
- 0% percentile: 37 · as of 13 November 2026
- CWE
- CWE-284CWE-862
Could this be exploited in your environment?
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