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CVE-2026-52779— OpenProject: Cross-project authorization bypass allows deleting public Calendar and Team Planner queries from unauthorized projects

Quick assessment

Affected
opf openproject
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

opf openproject是opf的项目管理软件。 OPF OpenProject 17.3.3之前版本和17.4.0至17.4.1之前版本存在授权问题漏洞，该漏洞源于Calendar和Team Planner模块中跨项目IDOR或授权上下文混淆问题，允许具有一个项目管理权限的用户从另一个项目删除公共Calendar或Team Planner查询，导致完整性影响和有限的可用性影响。

CVSS 5.4 · Medium EPSS 0.31% · P22

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 2

VendorProduct Version RangeStatus
opf openproject < 17.3.3 affected
>= 17.4.0, < 17.4.1 affected
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I. Basic Information for CVE-2026-52779

Vulnerability Information
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Vulnerability Title
OpenProject: Cross-project authorization bypass allows deleting public Calendar and Team Planner queries from unauthorized projects
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
OPF OpenProject 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
opf openproject是opf的项目管理软件。 OPF OpenProject 17.3.3之前版本和17.4.0至17.4.1之前版本存在授权问题漏洞，该漏洞源于Calendar和Team Planner模块中跨项目IDOR或授权上下文混淆问题，允许具有一个项目管理权限的用户从另一个项目删除公共Calendar或Team Planner查询，导致完整性影响和有限的可用性影响。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
opf openproject < 17.3.3 -

II. Public POCs for CVE-2026-52779

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III. Intelligence Information for CVE-2026-52779

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Vendor Advisories for CVE-2026-52779 (1)

Same Patch Batch · opf · 2026-06-26 · 17 CVEs total

CVE-2026-52782 9.9 CRITICAL OpenProject: IDOR through /projects/<A>/settings/project_storages/<A_ps_id> via PATCH para
CVE-2026-52785 9.9 CRITICAL OpenProject: SQL injection in timestamps functionality
CVE-2026-46386 9.9 CRITICAL OpenProject: Pre-authentication RCE in openproject/openproject Docker image via default `S
CVE-2026-52780 9.6 CRITICAL OpenProject: Cache store poisoning leads to Remote Code Execution (RCE)
CVE-2026-52784 8.8 HIGH OpenProject: CSRF on TARGET through /users/:id via POST parameter "user[admin]"
CVE-2026-52783 8.2 HIGH OpenProject: Information Disclosure (cleartext storage of data) on localhost through memca
CVE-2026-47193 7.5 HIGH OpenProject: Journal diff endpoint bypasses object, journal, and field visibility checks
CVE-2026-44734 6.5 MEDIUM OpenProject: Improper Access Control on OpenProject through the POST request to /projects/
CVE-2026-44736 6.5 MEDIUM OpenProject: Relations API Filter Bypasses Visibility Scope, Leaking Cross-Project Work Pa
CVE-2026-44735 6.5 MEDIUM OpenProject: Shares API Information Disclosure
CVE-2026-52781 6.4 MEDIUM OpenProject: Stored XSS on openproject.example.com through /api/v3/projects/{project}/work
CVE-2026-44733 5.9 MEDIUM OpenProject: Business Logic Error on OpenProject through PATCH request to /api/v3/users/me
CVE-2026-44696 5.7 MEDIUM OpenProject: Stored CSS injection via Sanitize::Config::RELAXED[:css] enables phishing ove
CVE-2026-49355 4.3 MEDIUM OpenProject: Private work package data disclosure through single meeting agenda item API
CVE-2026-44731 4.3 MEDIUM OpenProject: Improper Access Control on OpenProject through /projects/[projectName]/meetin
CVE-2026-44732 4.3 MEDIUM OpenProject: IDOR on OpenProject through /api/v3/documents/{id} via PATCH parameter "proje

IV. Related Vulnerabilities

Same product: openproject
Same vendor: opf
Same weakness: CWE-639

V. Comments for CVE-2026-52779

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