Server-Side Request Forgery (SSRF) in Wekan - #VU139851
Published: July 28, 2026
Vulnerability identifier: #VU139851
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:L/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: wekan.github.io
Affected software:
Wekan
Wekan
Detailed vulnerability description
The vulnerability allows a remote user to perform server-side request forgery against internal, loopback, or link-local services.
The vulnerability exists due to improper request validation in the outgoing-webhook URL validator in models/integrations.js when processing webhook URLs that use DNS-resolving hostnames. A remote user can supply a crafted webhook URL whose hostname resolves to a blocked address to perform server-side request forgery against internal, loopback, or link-local services.
The webhook send path does not re-validate the resolved IP address, and the issue is exploitable by a board admin on their own board without user interaction.
Remediation
Install security update from vendor's website.