SSRF in Openproject
CVE-2026-31974
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.0 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (15.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Openproject
- Opf Openproject — versions < 17.2.0
Weakness classification (CWE)
References
- github.com/opf/openproject/security/advisories/GHSA-9wr7-j98g-2jh3 (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-31974?
- CVE-2026-31974 is a low-severity vulnerability in Openproject, classified under Server-Side Request Forgery (SSRF). CVSS score: 3.0/10. Published 2026-03-11.
- How severe is CVE-2026-31974?
- Low severity. CVSS v3 base score is 3.0 out of 10.