SB20260505107 - Two vulnerabilities in Open WebUI

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Main Vulnerability Database SB20260505107

SB20260505107 - Two vulnerabilities in Open WebUI

Published: May 5, 2026

Security Bulletin ID SB20260505107
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Overly permissive cross-domain whitelist (CVE-ID: N/A)

CWE-ID: CWE-942 - Overly Permissive Cross-domain Whitelist

CVSSv4: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to bypass the CORS protection mechanism.

The vulnerability exists due to incorrect processing of the "Origin" HTTP header that is supplied within HTTP request and allow_credentials=True. A remote attacker can supply arbitrary value via the "Origin" HTTP header, bypass implemented CORS protection mechanism and perform cross-site scripting attacks against the vulnerable application.


2) Insufficient Session Expiration (CVE-ID: N/A)

CWE-ID: CWE-613 - Insufficient Session Expiration

CVSSv4: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient session expiration issue as the application fails to invalidate the session cookie after logout. A remote attacker can obtain or guess session token and gain unauthorized access to session that belongs to another user.


Remediation

Install update from vendor's website.

References