CVE-2026-31974 Blind SSRF on OpenProject instance via webhooks
Attackers can exploit blind SSRF in OpenProject webhooks and SMTP tests to scan internal networks and identify reachable services.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-31974?
CVE-2026-31974 is a low-severity server-side request forgery vulnerability in opf openproject, published on 11 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
OpenProject is an open-source, web-based project management software. Prior to 17.2.0, OpenProject SMTP test endpoint (POST /admin/settings/mail_notifications) accepts arbitrary host and port values and exhibits measurable differences in response behaviour depending on whether the target IP exists and whether the port is open. An attacker with access can use these timing and error distinctions to map internal hosts and identify which services/ports are reachable. Similarly, you can create webhooks in OpenProject and point them to arbitrary IPs, resulting in the same kind of SSRF issue which allows attackers to scan the internal network. This vulnerability is fixed in 17.2.0.
Weakness: CWE-918
Which versions are affected by CVE-2026-31974?
It affects 1 product.
Products include Openproject Openproject.
How do I fix CVE-2026-31974?
No fix has been published for CVE-2026-31974 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-31974 being exploited?
There is no known exploitation of CVE-2026-31974 in the wild and no public exploit code.
Other vulnerabilities in opf openproject
- CVE-2026-34717 OpenProject: SQL Injection in Cost Reporting =n Operator via parse_number_string
- CVE-2026-25763 Command Injection on OpenProject repositories leads to Remote Code Execution
- CVE-2026-24685 OpenProject has Argument Injection on Repository module that allows Arbitrary File Write
- CVE-2026-32698 OpenProject has a SQL Injection via Custom Field Name that can be chained to Remote Code Execution
- CVE-2026-32703 OpenProject's repository files are served with the MIME type allowing them to be used to bypass Content Security Policy
Sources
Also known as GHSA-9wr7-j98g-2jh3.