All vulnerabilities
CVE-2026-109284GHSA-6fjc-5cg3-mgvh

open-webui: Open WebUI 0.11.0 before 0.11.4 Improper Authorization via Chat Fork Endpoint

open-webui open-webui
Open in ThreatlineRecord JSON
CVSS
5.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.21%Chance of exploitation activity in the next 30 days, higher than 10% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in0.11.4Fixed versionCVE List
Published12 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

Open WebUI from 0.11.0 before 0.11.4 contains an improper authorization vulnerability in the chat fork handler, which places forked chats in the source chat's folder without checking folder write access. Shared folder members downgraded to read-only can call POST /api/v1/chats/{id}/fork on chats they created there while they had write access, inserting attacker-controlled chats visible to the folder owner and members.

Text from CVE List

Affected versions 2

  • open-webuiaffected: 0.11.0 before 0.11.4CVE List
  • open-webuiunaffected: 0.11.4CVE List

References 2