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Unsufficient access control leads to create Wiki objects belongs unpermitted projects

Moderate
klaustopher published GHSA-9gc6-3xjq-pwc9 Mar 5, 2026

Software

OpenProject

Affected versions

< 17.0.5

Patched versions

17.0.5, 17.1.2

Description

An attacker can create wiki pages belonging to unpermitted projects through an improperly authenticated request.


Credits

This vulnerability was reported by user bruhbey as part of the YesWeHack.com OpenProject Bug Bounty program, sponsored by the European Commission.

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVE ID

CVE-2026-27723

Weaknesses

No CWEs