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CVE-2026-44696— OpenProject: Stored CSS injection via Sanitize::Config::RELAXED[:css] enables phishing overlays and data exfiltration

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 17.4.0之前版本存在跨站脚本漏洞，该漏洞源于富文本渲染管道中内联样式清理配置不当，允许所有CSS属性在许可HTML元素的样式属性中使用，可能导致经身份验证的用户注入CSS。

CVSS 5.7 · Medium EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
opf openproject < 17.4.0 affected
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I. Basic Information for CVE-2026-44696

Vulnerability Information
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Vulnerability Title
OpenProject: Stored CSS injection via Sanitize::Config::RELAXED[:css] enables phishing overlays and data exfiltration
Source: CVE Program / CVE List V5
Vulnerability Description
OpenProject is open-source, web-based project management software. Prior to 17.4.0, OpenProject's rich text (markdown) rendering pipeline uses Sanitize::Config::RELAXED[:css] for inline style sanitization. This configuration permits essentially all CSS properties in style attributes on permitted HTML elements (figure, img, table, th, tr, td). This allows any authenticated user with write access to formattable text fields (work package descriptions, comments, project descriptions, news) to inject CSS This vulnerability is fixed in 17.4.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
OPF OpenProject 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
opf openproject是opf的项目管理软件。 OPF OpenProject 17.4.0之前版本存在跨站脚本漏洞，该漏洞源于富文本渲染管道中内联样式清理配置不当，允许所有CSS属性在许可HTML元素的样式属性中使用，可能导致经身份验证的用户注入CSS。
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 < 17.4.0 -

II. Public POCs for CVE-2026-44696

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III. Intelligence Information for CVE-2026-44696

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Vendor Advisories for CVE-2026-44696 (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-2026-52779 5.4 MEDIUM OpenProject: Cross-project authorization bypass allows deleting public Calendar and Team P
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-79

V. Comments for CVE-2026-44696

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