Vulnerability in Open-Webui
CVE-2026-88000
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, DELETE /api/v1/chats/{id}/messages/{message_id} used the chat-history deletion helper in backend/open_webui/models/chats.py to follow childrenIds without recording visited message identifiers. An authenticated user could store a cyclic chat tree and delete a message, causing a synchronous infinite loop on the server request loop that blocked every user's requests until the process was killed. This issue is fixed in version 0.11.1.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Open-Webui — versions >= 0.10.0, < 0.11.1
- Openwebui Open Webui
Weakness classification (CWE)
References
- github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2 (Exploit, Vendor Advisory)
- github.com/open-webui/open-webui/pull/28035 (Exploit, Patch)
- github.com/open-webui/open-webui/commit/b933292d63d12be3fd1416fe55519ddc7aa336bc (Patch)
- github.com/open-webui/open-webui/releases/tag/v0.11.1 (Release Notes)
Frequently asked questions
- What is CVE-2026-88000?
- CVE-2026-88000 is a medium-severity vulnerability in Open-Webui, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 6.5/10. Published 2026-09-09.
- How severe is CVE-2026-88000?
- Medium severity. CVSS v3 base score is 6.5 out of 10.