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VulnerabilityPublished Updated

CVE-2026-52783: opf openproject · Cleartext Storage in a File or on Disk

Affects opf openprojectSource CVE Database V5

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Not known to be exploited · CVSS 8.2 High : upgrade to 17.4.1 or 17.3.3 soon.

Data as of 8 Nov 2026, 23:24 UTC

CVSS 3.1 base score
8.2High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 17.4.1, 17.3.3
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 8 Nov 2026.

What to do

Upgrade openproject and opf/openproject to 17.4.1 or 17.3.3.

Affected software

ProductAffectedFixed in
opfopenprojectAffected
  • >=17.4.0 <17.4.1
Fixed in
  • 17.4.1
opfopenprojectAffected
  • <17.3.3
Fixed in
  • 17.3.3
GitHubopf/openprojectpkg:github/opf/openprojectOther threatsAffected
  • <17.3.3
  • <17.4.1
Fixed in
  • 17.3.3
  • 17.4.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available and the vulnerability is fixed in OpenProject versions 17.3.3 and 17.4.1. Users should upgrade to at least these versions to remediate the issue. Since this is a cloud service, the vendor manages remediation for hosted instances; for self-hosted deployments, apply the official updates promptly.

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.

References

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