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TI-2026-37894 Aliases CVE-2026-52779

Authorization bypass in opf openproject

Priority MEDIUM 58CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, a cross-project IDOR / authorization context confusion in the Calendar and Team Planner modules allows a user with management permissions in one project to delete public Calendar or Team Planner Queries from another project where they do not have the corresponding management permissions. Both modules authorize the request against the project identified by :project_id in the URL, but the actual Query object is loaded later by :id from Query.visible(current_user) without verifying that the loaded Query belongs to the authorized project. As a result, an attacker can use permissions from Project A to delete shared/public Calendar or Team Planner views from Project B, causing integrity impact and limited availability impact for users relying on those shared views. This vulnerability is fixed in 17.3.3 and 17.4.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00222 12th percentileScored 2026-11-07
Fix Fixed openproject (opf): 17.3.3, 17.4.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
opfopenprojectbefore 17.3.3; 17.4.0 to before 17.4.117.3.3, 17.4.1Patch availableCNA
  • openproject Vendoropf Affected before 17.3.3; 17.4.0 to before 17.4.1 Fixed in 17.3.3, 17.4.1 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:openproject:openproject:*:*:*:*:*:*:*:*——opf
  • cpe:2.3:a:openproject:openproject:*:*:*:*:*:*:*:* Versions — — ·opf

Remediation

  • Fix · CNA openproject (opf) Fixed in 17.3.3, 17.4.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-52779

References

Other 1

  • TI-2019-08673 A SQL injection vulnerability in the activities API in OpenProject before 8.3.2 allows a… CVSS 3.0HIGH 8.1
  • TI-2026-34781 OpenProject: Journal diff endpoint bypasses object, journal, and field visibility checks CVSS 3.1HIGH 7.5
  • TI-2026-26047 OpenProject: 2FA OTP Verification Missing Rate Limiting CVSS 3.1HIGH 7.4
  • TI-2026-29552 OpenProject has Cross-Project Meeting Agenda Item Injection via Unscoped Section Lookup CVSS 3.1HIGH 7.1
  • TI-2026-32623 OpenProject: Relations API Filter Bypasses Visibility Scope, Leaking Cross-Project Work Package Subjects CVSS 3.1MEDIUM 6.5
  • TI-2023-14850 OpenProject user sessions not terminated after activation of 2FA CVSS 3.1MEDIUM 6.5
See all 57 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences