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CVE-2026-46386— OpenProject: Pre-authentication RCE in openproject/openproject Docker image via default `SECRET_KEY_BASE=OVERWRITE_ME` and `cookies_serializer = :marshal`

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存在安全漏洞，该漏洞源于默认Rails主密钥弱和Marshal反序列化配置，可能导致登录用户通过/my/two_factor_devices cookie读取器进行确定性Marshal反序列化。

CVSS 9.9 · Critical EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
opf openproject >= 8.3.0, < 17.2.4 affected
>= 17.3.0, < 17.3.2 affected
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I. Basic Information for CVE-2026-46386

Vulnerability Information
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Vulnerability Title
OpenProject: Pre-authentication RCE in openproject/openproject Docker image via default `SECRET_KEY_BASE=OVERWRITE_ME` and `cookies_serializer = :marshal`
Source: CVE Program / CVE List V5
Vulnerability Description
OpenProject is open-source, web-based project management software. Prior to , the official openproject/openproject Docker image ships ENV SECRET_KEY_BASE=OVERWRITE_ME as the default Rails master key. Combined with cookies_serializer = :marshal, this gives any logged-in user a deterministic Marshal-deserialization path reachable via the /my/two_factor_devices cookie reader This vulnerability is fixed in .
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
OPF OpenProject 配置错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
opf openproject是opf的项目管理软件。 OPF OpenProject存在安全漏洞，该漏洞源于默认Rails主密钥弱和Marshal反序列化配置，可能导致登录用户通过/my/two_factor_devices cookie读取器进行确定性Marshal反序列化。
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 >= 8.3.0, < 17.2.4 -

II. Public POCs for CVE-2026-46386

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III. Intelligence Information for CVE-2026-46386

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Vendor Advisories for CVE-2026-46386 (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-2026-52780 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-2026-52779 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-502

V. Comments for CVE-2026-46386

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