Internal network reconnaissance via blind SSRF
Published Mar 11, 2026 · Updated Mar 11, 2026
Blind SSRF in OpenProject before 17.2.0 allows remote authenticated users to map internal hosts and ports through outbound requests. The SMTP test endpoint accepts arbitrary host and port values and exposes reachability through response timing and errors, while webhooks likewise accept arbitrary IP destinations. Administrative access is required for the SMTP test path, and webhook creation privileges expose the same internal-network reconnaissance consequence.
Summary
What happened
Blind SSRF in OpenProject before 17.2.0 allows remote authenticated users to map internal hosts and ports through outbound requests. The SMTP test endpoint accepts arbitrary host and port values and exposes reachability through response timing and errors, while webhooks likewise accept arbitrary IP destinations. Administrative access is required for the SMTP test path, and webhook creation privileges expose the same internal-network reconnaissance consequence.
The record
- CVE
- CVE-2026-31974
- Published
- Mar 11, 2026
- Updated
- Mar 11, 2026
- Vendor
- OpenProject GmbH
- Product
- OpenProject
- Classifications
- CWE-918, T1046
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Mar 11, 2026CVE publishedPublication date reported by the CVE source.
- Mar 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 17.2.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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