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TI-2026-71108 Aliases CVE-2026-109292GHSA-crcq-c44m-c92x

Session cookie disclosure in Open WebUI OAuth-mode connections

Priority HIGH 68CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
Information disclosure
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-200.

Summary

Open WebUI from 0.6.27 before 0.11.4 discloses user session cookies to destination servers, because OAuth-mode connections forward the full browser cookie jar. An operator of an OpenAI-compatible connection, an OpenAPI tool server or a terminal server can capture forwarded session cookies from routine requests and replay them to hijack accounts, including administrator accounts. The weakness is classified as CWE-200.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

Open WebUI from 0.6.27 before 0.11.4 contains an information disclosure vulnerability that allows destination servers to obtain user session cookies by receiving the full browser cookie jar 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 administrators.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00409 35th percentileScored 2026-11-07
Fix Fixed open-webui (open-webui): 0.11.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
open-webuiopen-webui0.6.27 to before 0.11.40.11.4Patch availableCNA
  • open-webui Vendoropen-webui Affected 0.6.27 to before 0.11.4 Fixed in 0.11.4 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*——open-webui
  • cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:* Versions — — ·open-webui

Remediation

Upgrade Open WebUI to version 0.11.4 or later, which fixes the issue in the affected range. The sources list no advisory identifier for this fix.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA open-webui (open-webui) Fixed in 0.11.4

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    open-webui 0.11.4

    19 records Highest priority Priority HIGH 3 HIGH, 8 MEDIUM, 8 LOW

    Other records, highest priority first

    • TI-2026-71106 Stored cross-site scripting in Open WebUI via DOCX previewPriority HIGH 72
    • TI-2026-71104 Stored cross-site scripting in Open WebUI markdown linksPriority HIGH 67
    • TI-2026-71114 Memory exhaustion in Open WebUI knowledge search via regex patternsPriority MEDIUM 64
    Show all 19 records →

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-109292
  2. 2026-10-12 Alias added: GHSA-crcq-c44m-c92x
  3. 2026-10-13 Priority changed: MEDIUM → LOW
  4. 2026-10-15 CISA SSVC decision points changed
  5. 2026-10-15 Priority changed: LOW → HIGH

References

Patch 3

Advisory 1

  • TI-2024-06216 Open WebUI Arbitrary File Upload + Path Traversal CVSS 3.1HIGH 8.8
  • TI-2024-07467 Improper Authentication in open-webui/open-webui CVSS 3.1HIGH 8.2
  • TI-2026-42359 Open WebUI: Cross-user code-interpreter and tool execution via unvalidated Socket.IO event-caller session_id CVSS 3.1CRITICAL 9.0
  • TI-2026-40759 open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation CVSS 4.0CRITICAL 9.0
  • TI-2024-07431 Cross-site Scripting (XSS) in open-webui/open-webui CVSS 3.0CRITICAL 9.0
  • TI-2026-60021 Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin CVSS 3.1HIGH 8.7
See all 175 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences