CVE-2026-70481
Open WebUI: Any member with write access to a standard channel can edit or delete other members' messages
- Published
- Aug 4, 2026
- Updated
- Aug 5, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 5, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:LLow · next 30 days
- Percentile
- 22.3%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1Proof-of-concept exploit for an authorization flaw in Open WebUI that lets low-privileged users edit and delete other members' channel messages via crafted API calls.
Responsible use
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