Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-87015

CVE-2026-87015MEDIUM

open-webui open-webui — Open WebUI: A user's session cookies are sent to tool servers configured for bearer authentication

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   N   R  U  H  H  N    6.8   .0048   39.1     —

AFFECTED
  Product     Versions               Fixed
  open-webui  >= 0.6.27, < 0.11.1 –  —

TIMELINE
  Sep 8   Reserved by GitHub_M
  Sep 9   Published (CNA: GitHub_M)
  Sep 15  EXPLOIT PUBLISHED — CVE-2026-87015 (open-webui). Public exploit reference added.

CWE-201 · CNA: GitHub_M · CVSS v3.1 · 4 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 8, 2026	Reserved	Reserved by GitHub_M
September 9, 2026	Published	Published (CNA: GitHub_M)
September 15, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-87015 (open-webui). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
open-webui	open-webui	—	>= 0.6.27, < 0.11.1	—

Weaknesses

CWE-201

References (4)

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]

Authoritative record: CVE-2026-87015 at cve.org

Vendors: open-webui

Weaknesses: CWE-201

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-87015 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.