EUVD-2026-39869Severity 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
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Lifecycle Timeline
3DescriptionCVE.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.
AnalysisAI
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. …
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Recommended ActionAI
Within 24 hours: Identify all OpenProject instances running versions prior to 17.3.3 and 17.4.1 with Storages module enabled. …
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Same weakness CWE-313 – Cleartext Storage in a File or on Disk
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External POC / Exploit Code
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