EUVD-2026-39869Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V14 - Data Protection File/disk data protection
|
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Alert meAnalysisAIv1 – Jun 26, 2026
Cleartext credential disclosure in OpenProject's Storages module (versions prior to 17.3.3 and 17.4.1) writes the userless OneDrive/SharePoint OAuth access_token in plaintext to Rails.cache under the deterministic key storage.<id>.httpx_access_token, refreshed by an hourly cron and every userless-OAuth call. Because none of the supported cache backends (file_store, memcache, redis) encrypts at rest, an attacker who can read the cache backend retrieves the Azure-AD application-tier bearer token via an anonymous memcached/Redis get. No public exploit has been identified at time of analysis, and it is not listed in CISA KEV.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
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Severity by source
AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Primary rating from Vendor (GitHub_M) · only source for this CVE.
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
2DescriptionCVE.org
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.
Executive ViewAI
OpenProject's Storages module (versions prior to 17.3.3 and 17.4.1) stores Azure AD OAuth access tokens in plaintext cache backends, exposing credentials to anyone with cache access. Organizations integrating OpenProject with OneDrive or SharePoint risk unauthorized access to cloud storage and corporate data. No patch is currently available.
Within 24 hours: Identify all OpenProject instances running versions prior to 17.3.3 and 17.4.1 with Storages module enabled. Within 7 days: Restrict network access to cache backends (memcached, Redis, file-based caches) via firewall and VPC controls; enable authentication on all cache services. Within 30 days: Upgrade to OpenProject 17.3.3 or 17.4.1 once released, or disable Storages module if upgrade timeline extends beyond 30 days.
No vendor-released patch identified at time of analysis. Interim mitigations: (1) Restrict network access to cache backends via firewall rules and VPC security groups to authorized systems only; (2) Enable authentication and TLS on memcached and Redis services; (3) Disable userless OAuth in OpenProject Storages configuration if operationally feasible; (4) Implement access logging and alerting on cache backend connections; (5) Immediately rotate Azure AD application credentials used by OpenProject.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.
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