CVE-2026-88000: open webui — Exploit & Fix

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.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0033

Probability of exploitation

0.26%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-835 CWE-835

Affected Products

Vendor	Product	Versions
openwebui	open_webui	0.10.0 — 0.11.1

References

Advisories & Patches

https://github.com/open-webui/open-webui/commit/b933292d63d12be3fd1416fe55519ddc7aa336bc https://github.com/open-webui/open-webui/pull/28035 https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2 https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2

Exploits

https://github.com/open-webui/open-webui/pull/28035 https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2 https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2

Other References

https://github.com/open-webui/open-webui/releases/tag/v0.11.1

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-88000? +

CVE-2026-88000 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0033, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-88000? +

CVE-2026-88000 affects products from openwebui, specifically: open_webui. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-88000? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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