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

Quick assessment

Affected
opf openproject
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 3.0 · Low EPSS 0.26% · P16
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
opf openproject < 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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Vendor Advisories for CVE-2026-31974 (1)

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

CVE-2026-30234 6.5 MEDIUM OpenProject BIM BCF XML Import: <Snapshot> Path Traversal Leads to Arbitrary Local File Re
CVE-2026-30239 6.5 MEDIUM OpenProject has a Permission Check bypass on Budget deletion allows reassignment of WorkPa
CVE-2026-30235 6.5 MEDIUM Business Logic Error on OpenProject through hyperlinks in markdown using DOM clobbering
CVE-2026-30236 4.3 MEDIUM OpenProject 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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