CVE-2026-16889
Published:October 29, 2026
Updated:October 30, 2026
In openEQUELLA before 2026.1, the pre-login notice image upload endpoint (PUT /api/preloginnotice/image/{name}) does not validate the type of uploaded files and serves them with a Content-Type derived from the supplied filename. A user holding the EDIT_SYSTEM_SETTINGS permission can upload an HTML file that is then served as text/html from the openEQUELLA origin, resulting in stored cross-site scripting. Unauthenticated exploitation is possible where EDIT_SYSTEM_SETTINGS has been granted to the guest user or everyone.
Affected Packages
https://github.com/openequella/openEQUELLA.git (GITHUB):
Affected version(s) >=2019.1-Stable <2026.1.0 || >=2020.1.0-RC1 <2026.1.0 || >=2021.1.0-RC1 <2026.1.0 || >=2022.1.0 <2026.1.0 || >=2023.1.0 <2026.1.0 || >=2024.1.0 <2026.1.0 || >=2025.1.0 <2026.1.0Fix Suggestion:
Update to version 2026.1.0Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
4.8
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Unrestricted Upload of File with Dangerous Type
EPSS
Base Score:
0.32