MediumVulnerability

CVE-2026-109292: Open WebUI information disclosure exposing session cookies on OAuth connections

Source: NVD(opens in a new tab)
Identifier: CVE-2026-109292
Published: October 12, 2026
Record updated: October 12, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.

Summary

Open WebUI from 0.6.27 before 0.11.4 forwards the full browser cookie jar to destination servers on OAuth-mode connections. Operators of OpenAI-compatible connections, OpenAPI tool servers or terminal servers can capture forwarded session cookies from routine requests and replay them to hijack accounts, including administrator accounts.

Mitigation

Fixed in 0.11.4.

Details

Scores and exploitation

CVSS score: 6.8(medium)
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack vector: network
Attack complexity: high
Privileges required: none
User interaction: required
EPSS: Not scored. FIRST had not published an EPSS score for this CVE when it was last checked on October 12, 2026.
Disclosure date: October 12, 2026

Weaknesses and techniques

Weakness (CWE): CWE-200
Attack pattern (CAPEC): CAPEC-116

Classification

Attack type: Other
Attack sophistication: Moderate
AI component targeted: API
Impact: Confidentiality
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-109292

First tracked: October 12, 2026 at 02:07 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 92% (self-assessed)

Summary

Mitigation

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