CVE-2026-88000
Open WebUI: Any authenticated user can hang the server via message deletion in a cyclic chat tree
Description
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.
INFO
Published Date :
Sept. 9, 2026, 10:18 p.m.
Last Modified :
Sept. 14, 2026, 5:48 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Open WebUI to version 0.11.1.
- Apply any security patches or updates for Open WebUI.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-88000.
| URL | Resource |
|---|---|
| https://github.com/open-webui/open-webui/commit/b933292d63d12be3fd1416fe55519ddc7aa336bc | Patch |
| https://github.com/open-webui/open-webui/pull/28035 | Exploit Patch |
| https://github.com/open-webui/open-webui/releases/tag/v0.11.1 | Release Notes |
| https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2 | Exploit Vendor Advisory |
| https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2 | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-88000 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-88000
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-88000 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-88000 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Sep. 14, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:* versions from (including) 0.10.0 up to (excluding) 0.11.1 Added Reference Type GitHub, Inc.: https://github.com/open-webui/open-webui/commit/b933292d63d12be3fd1416fe55519ddc7aa336bc Types: Patch Added Reference Type GitHub, Inc.: https://github.com/open-webui/open-webui/pull/28035 Types: Exploit, Patch Added Reference Type GitHub, Inc.: https://github.com/open-webui/open-webui/releases/tag/v0.11.1 Types: Release Notes Added Reference Type CISA-ADP: https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2 Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2 Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 10, 2026
Action Type Old Value New Value Added Reference https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2 Added SSVC {'id': 'CVE-2026-88000', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-09-10T17:52:43.522488Z'} -
New CVE Received by [email protected]
Sep. 09, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-835 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/88xxx/CVE-2026-88000.json">CVE-2026-88000</a> Added Reference https://github.com/open-webui/open-webui/commit/b933292d63d12be3fd1416fe55519ddc7aa336bc Added Reference https://github.com/open-webui/open-webui/pull/28035 Added Reference https://github.com/open-webui/open-webui/releases/tag/v0.11.1 Added Reference https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2