CVE-2026-70481 Details
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.
A vulnerability in Open WebUI versions 0.5.0 prior to 0.11.0 allows any member with write access to a standard channel to edit or delete messages authored by other participants. This issue arises because the message update and delete handlers for standard channels did not enforce authorship, unlike group and direct message channels. The vulnerability could be exploited by any authenticated user with write permissions on the channel, without the need for administrative rights.
Users can upgrade to Open WebUI version 0.11.0 or later, where this vulnerability has been fixed. No additional configuration is required after the upgrade.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Aug 5, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/open-webui/open-webui/commit/c609ec41154fa092fa0af80d9d365de06b666286 | [email protected] | Patch |
| https://github.com/open-webui/open-webui/pull/27197 | [email protected] | PatchVendor Advisory |
| https://github.com/open-webui/open-webui/releases/tag/v0.11.0 | [email protected] | Release Notes |
| https://github.com/open-webui/open-webui/security/advisories/GHSA-mj5r-jf49-m3w7 | [email protected] | ExploitPatchVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-284 | Improper Access Control | [email protected] |
| CWE-862 | Missing Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| openwebui open webui | >= 0.5.0, < 0.11.0 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 18, 2026 | Initial Analysis | [email protected] |
| Aug 5, 2026 | CVE Modified | CISA-ADP |
| Aug 4, 2026 | New CVE Received | [email protected] |