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Vulnerabilities

Vulnerability · CVE-2026-40896

OpenProject is open-source, web-based project management software.

Published Apr 20, 2026 · catalog updated Jun 17, 2026 · OpenProject is open-source, web-based

Check if you run it

No confirmed exploitation is on record for CVE-2026-40896. EPSS is 0.24%. Act only if a listed version of OpenProject is open-source, web-based is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (OpenProject is open-source, web-based).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.24%
Remediation
Advisory link
Affected products
cpe openproject/openproject

OpenProject is open-source, web-based project management software. Prior to version 17.3.0, a user with 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe openproject/openprojectversion unspecified

How to fix CVE-2026-40896

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-40896. EPSS is 0.24%. Act only if a listed version of OpenProject is open-source, web-based is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition; CWE-639: Authorization Bypass Through User-Controlled Key. EPSS 0.24%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 20, 2026 · NIST NVD

    Detected

    OpenProject is open-source, web-based project management software. Prior to version 17.3.0, a user with 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 it

  2. Jun 17, 2026 · NIST NVD

    Updated

    OpenProject is open-source, web-based project management software. Prior to version 17.3.0, a user with 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 it

Sources

  • CVE.orgVulnerability recordCVE-2026-40896

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-40896

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-2026-40896

    OpenProject is open-source, web-based project management software. Prior to version 17.3.0, a user with 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 knowl

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.