CVE-2026-88000CWE-835

CVE-2026-88000

Medium · published September 10, 2026

CVSS v3.1
6.5
EPSS
1%
Percentile
47.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00592 · 47.6th percentile
Weakness
CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
Published
2026-09-10T02:18Z
Affected products (1)
ProductVersionsFixed in
openwebui/open_webui≥ 0.10.0, < 0.11.10.11.1
References (5)
https://github.com/open-webui/open-webui/commit/b933292d63d12be3fd1416fe55519ddc7aa336bc · [email protected]https://github.com/open-webui/open-webui/pull/28035 · [email protected]https://github.com/open-webui/open-webui/releases/tag/v0.11.1 · [email protected]https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2 · [email protected]https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 11 SEP 03:19Z
    EPSS moved — → 0%
    epss
  • 09 SEP 21:35Z
    Open WebUI: Any authenticated user can hang the server via message deletion in a cyclic chat tree
    cvelistv5