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CVE-2026-67527— OpenProject: Improper Access Control through /api/v3/work_packages/<X.id> via PATCH parameter "fileLinks"

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.

OpenProject是OpenProject组织开源的一个基于Web的项目管理软件。 OpenProject 17.6.0之前版本存在授权问题漏洞，该漏洞源于PATCH /api/v3/work_packages/{id}接口接受_links.fileLinks参数，允许具有edit_work_packages权限但无manage_file_links权限的认证用户通过原始ID解析Storages::FileLink记录，分离或硬删除现有FileLink，并将其他项目的FileLink重新挂载至攻击者控

CVSS 7.6 · High EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
opf openproject < 17.6.0 affected
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I. Basic Information for CVE-2026-67527

Vulnerability Information
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Vulnerability Title
OpenProject: Improper Access Control through /api/v3/work_packages/<X.id> via PATCH parameter "fileLinks"
Source: CVE Program / CVE List V5
Vulnerability Description
OpenProject is open-source, web-based project management software. Prior to 17.6.0, PATCH /api/v3/work_packages/{id} accepted _links.fileLinks and allowed authenticated users with edit_work_packages but without manage_file_links to resolve Storages::FileLink records by raw id, detach or hard-delete existing FileLinks, and re-parent FileLinks from other projects to an attacker-controlled work package, exposing origin filename, origin id, and MIME type metadata. This issue is fixed in 17.6.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
OpenProject 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenProject是OpenProject组织开源的一个基于Web的项目管理软件。 OpenProject 17.6.0之前版本存在授权问题漏洞，该漏洞源于PATCH /api/v3/work_packages/{id}接口接受_links.fileLinks参数，允许具有edit_work_packages权限但无manage_file_links权限的认证用户通过原始ID解析Storages::FileLink记录，分离或硬删除现有FileLink，并将其他项目的FileLink重新挂载至攻击者控
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 < 17.6.0 -

II. Public POCs for CVE-2026-67527

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III. Intelligence Information for CVE-2026-67527

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Patches & Fixes for CVE-2026-67527 (2)

Vendor Advisories for CVE-2026-67527 (1)

Same Patch Batch · opf · 2026-07-30 · 3 CVEs total

CVE-2026-67528 4.3 MEDIUM OpenProject: Improper Access Control through /api/v3/custom_options/:id via Path "id" lead
CVE-2026-67529 4.3 MEDIUM OpenProject: Private work package subject/identity disclosure through the global Time Entr

IV. Related Vulnerabilities

Same product: openproject
Same vendor: opf
Same weakness: CWE-862

V. Comments for CVE-2026-67527

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