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CVE-2026-31974— Blind SSRF on OpenProject instance via webhooks

CVSS 3.0 · Low EPSS 0.03% · P9
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I. Basic Information for CVE-2026-31974

Vulnerability Information
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Vulnerability Title
Blind SSRF on OpenProject instance via webhooks
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
OpenProject 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenProject是OpenProject开源的一个基于Web的项目管理软件。 OpenProject 17.2.0之前版本存在代码问题漏洞，该漏洞源于SMTP测试端点和Webhook可接受任意主机和端口值，可能导致内部网络扫描。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
opfopenproject < 17.2.0 -

II. Public POCs for CVE-2026-31974

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III. Intelligence Information for CVE-2026-31974

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Same Patch Batch · opf · 2026-03-11 · 5 CVEs total

CVE-2026-302346.5 MEDIUMOpenProject BIM BCF XML Import: <Snapshot> Path Traversal Leads to Arbitrary Local File Re
CVE-2026-302396.5 MEDIUMOpenProject has a Permission Check bypass on Budget deletion allows reassignment of WorkPa
CVE-2026-302356.5 MEDIUMBusiness Logic Error on OpenProject through hyperlinks in markdown using DOM clobbering
CVE-2026-302364.3 MEDIUMOpenProject users that are not project members can be used to calculate Labor Budget, leak

IV. Related Vulnerabilities

Same product: openproject
Same vendor: opf
Same weakness: CWE-918

V. Comments for CVE-2026-31974

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