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CVE-2026-52783— OpenProject: Information Disclosure (cleartext storage of data) on localhost through memcached via Others "storage.<id>.httpx_access_token" leads to Sensitive Data Exposure

CVSS 8.2 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1AI

T1552.001 · Credentials In Files

Affected Version Matrix 2

VendorProductVersion RangeStatus
opfopenproject< 17.3.3affected
>= 17.4.0, < 17.4.1affected
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I. Basic Information for CVE-2026-52783

Vulnerability Information
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Vulnerability Title
OpenProject: Information Disclosure (cleartext storage of data) on localhost through memcached via Others "storage.<id>.httpx_access_token" leads to Sensitive Data Exposure
Source: NVD (National Vulnerability Database)
Vulnerability Description
OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, OpenProject's Storages module writes the OneDrive/SharePoint userless OAuth access_token plaintext to Rails.cache under the deterministic key storage.<id>.httpx_access_token, repopulated continuously by an hourly cron and every userless-OAuth call site (see Write cadence). None of the three allowed cache backends (file_store, memcache, redis) encrypts at rest. An attacker with read access to the cache backend recovers the Azure-AD application-tier bearer with an anonymous get over the memcached binary protocol (or the equivalent against Redis). This vulnerability is fixed in 17.3.3 and 17.4.1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在文件或磁盘上的明文存储
Source: NVD (National Vulnerability Database)
Vulnerability Title
OPF OpenProject 加密问题漏洞
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之前版本存在加密问题漏洞，该漏洞源于Storages模块将OneDrive/SharePoint用户免密OAuth访问令牌以明文写入Rails.cache，且缓存后端未加密，可能导致具有缓存后端读取权限的攻击者恢复Azure-AD应用层令牌。
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

VendorProductAffected VersionsCPESubscribe
opfopenproject < 17.3.3 -

II. Public POCs for CVE-2026-52783

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III. Intelligence Information for CVE-2026-52783

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Vendor Advisories for CVE-2026-52783 (1)

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

CVE-2026-527829.9 CRITICALOpenProject: IDOR through /projects/<A>/settings/project_storages/<A_ps_id> via PATCH para
CVE-2026-527859.9 CRITICALOpenProject: SQL injection in timestamps functionality
CVE-2026-463869.9 CRITICALOpenProject: Pre-authentication RCE in openproject/openproject Docker image via default `S
CVE-2026-527809.6 CRITICALOpenProject: Cache store poisoning leads to Remote Code Execution (RCE)
CVE-2026-527848.8 HIGHOpenProject: CSRF on TARGET through /users/:id via POST parameter "user[admin]"
CVE-2026-471937.5 HIGHOpenProject: Journal diff endpoint bypasses object, journal, and field visibility checks
CVE-2026-447346.5 MEDIUMOpenProject: Improper Access Control on OpenProject through the POST request to /projects/
CVE-2026-447366.5 MEDIUMOpenProject: Relations API Filter Bypasses Visibility Scope, Leaking Cross-Project Work Pa
CVE-2026-447356.5 MEDIUMOpenProject: Shares API Information Disclosure
CVE-2026-527816.4 MEDIUMOpenProject: Stored XSS on openproject.example.com through /api/v3/projects/{project}/work
CVE-2026-447335.9 MEDIUMOpenProject: Business Logic Error on OpenProject through PATCH request to /api/v3/users/me
CVE-2026-446965.7 MEDIUMOpenProject: Stored CSS injection via Sanitize::Config::RELAXED[:css] enables phishing ove
CVE-2026-527795.4 MEDIUMOpenProject: Cross-project authorization bypass allows deleting public Calendar and Team P
CVE-2026-493554.3 MEDIUMOpenProject: Private work package data disclosure through single meeting agenda item API
CVE-2026-447314.3 MEDIUMOpenProject: Improper Access Control on OpenProject through /projects/[projectName]/meetin
CVE-2026-447324.3 MEDIUMOpenProject: IDOR on OpenProject through /api/v3/documents/{id} via PATCH parameter "proje

IV. Related Vulnerabilities

Same product: openproject
Same vendor: opf
Same weakness: CWE-313

V. Comments for CVE-2026-52783

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