Medium 6.8Published Sep 9, 2026

CVE-2026-87015Open WebUI: A user's session cookies are sent to tool servers configured for bearer authentication

Updated under an hour ago (2026-10-19 08:50 UTC)

Does this affect you?

It affects open-webui and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for open-webui

Exploited in the last 30 days

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.

CVSS: 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-201
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Sep 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

open-webui open-webui open_webui:open_webui (from the name)	from 0.6.27, < 0.11.1	CNA record
openwebui open_webui openwebui:open_webui	from 0.6.27 before 0.11.1	NVD

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7x-refsource-confirm, exploit, vendor-advisory
https://github.com/open-webui/open-webui/pull/28630x-refsource-misc, issue-tracking, patch
https://github.com/open-webui/open-webui/commit/cd9db21c5276807a2975ddba17cef369ad1114b7x-refsource-misc, patch
https://github.com/open-webui/open-webui/releases/tag/v0.11.1x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.