CVE-2026-87015
Open WebUI: A user's session cookies are sent to tool servers configured for bearer authentication
Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.27 until 0.11.1, backend/open_webui/utils/tools.py captured a cookie jar from the enclosing connection loop instead of binding it to each external tool callable. When multiple tool servers were attached and a session or system OAuth connection was processed last, a request to a different server configured for bearer authentication could include the calling user's Open WebUI session cookies, allowing that server's operator to reuse the session and take over the account. This issue is fixed in version 0.11.1.
INFO
Published Date :
Sept. 9, 2026, 9:17 p.m.
Last Modified :
Sept. 15, 2026, 3:54 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 or later.
- Review configurations for attached tool servers.
- Monitor for suspicious account activity.
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-2026-87015.
| URL | Resource |
|---|---|
| https://github.com/open-webui/open-webui/commit/cd9db21c5276807a2975ddba17cef369ad1114b7 | Patch |
| https://github.com/open-webui/open-webui/pull/28630 | Issue Tracking 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-p78m-89r6-pgf7 | Exploit Vendor Advisory |
| https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7 | 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-2026-87015 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-2026-87015
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-2026-87015 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-87015 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. 15, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:* versions from (including) 0.6.27 up to (excluding) 0.11.1 Added Reference Type GitHub, Inc.: https://github.com/open-webui/open-webui/commit/cd9db21c5276807a2975ddba17cef369ad1114b7 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/open-webui/open-webui/pull/28630 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/open-webui/open-webui/releases/tag/v0.11.1 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7 Types: Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7 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-p78m-89r6-pgf7 Added SSVC {'id': 'CVE-2026-87015', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-10T13:50:14.302791Z'} -
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 0.6.27 until 0.11.1, backend/open_webui/utils/tools.py captured a cookie jar from the enclosing connection loop instead of binding it to each external tool callable. When multiple tool servers were attached and a session or system OAuth connection was processed last, a request to a different server configured for bearer authentication could include the calling user's Open WebUI session cookies, allowing that server's operator to reuse the session and take over the account. This issue is fixed in version 0.11.1. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N Added CWE CWE-201 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/87xxx/CVE-2026-87015.json">CVE-2026-87015</a> Added Reference https://github.com/open-webui/open-webui/commit/cd9db21c5276807a2975ddba17cef369ad1114b7 Added Reference https://github.com/open-webui/open-webui/pull/28630 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-p78m-89r6-pgf7