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Vulnerability record · CVE-2026-40896 · published 20 April 2026

CVE-2026-40896: Openproject toctou race condition vulnerability

Openproject · Openproject

OpenProject is open-source, web-based project management software. Prior to version 17.3.0, a user with `manage_agendas` permission in any project can inject agenda items into meetings belonging to any other project on the instance — even projects they have no access to. No knowledge of the target project, meeting, or victim is required; the attacker can blindly spray items into every meeting on the instance by iterating sequential section IDs. Version 17.3.0 patches the issue.

7.1 CVSS 3.1 High EPSS 0.24% · top 86.4% CWE-367 · TOCTOU race conditionCWE-639 · Insecure direct object reference
7.1CVSS 3.1 base score
0.24%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

OpenProject is open-source, web-based project management software. Prior to version 17.3.0, a user with `manage_agendas` permission in any project can inject agenda items into meetings belonging to any other project on the instance — even projects they have no access to. No knowledge of the target project, meeting, or victim is required; the attacker can blindly spray items into every meeting on the instance by iterating sequential section IDs. Version 17.3.0 patches the issue.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/opf/openproject/commit/8f693a1f35d0a84bb69af78fb6925f74329ae4fe Patch
https://github.com/opf/openproject/security/advisories/GHSA-hh5p-gwf8-h245 ExploitMitigationVendor Advisory
https://github.com/opf/openproject/security/advisories/GHSA-hh5p-gwf8-h245 ExploitMitigationVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-40896), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.