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VulnerabilityPublished

CVE-2026-44696: opf openproject · Cross-site Scripting

Affects opf openprojectSource CVE Database V5

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Not known to be exploited · CVSS 5.7 Medium : upgrade to 17.4.0 when convenient.

Data as of 7 Nov 2026, 23:24 UTC

CVSS 3.1 base score
5.7Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 16% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 17.4.0
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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 17.4.0.

Affected software

ProductAffectedFixed in
opfopenprojectAffected
  • <17.4.0
Fixed in
  • 17.4.0
GitHubopf/openprojectpkg:github/opf/openprojectOther threatsAffected
  • <17.4.0
Fixed in
  • 17.4.0

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

AI-suggested

Upgrade OpenProject to version 17.4.0 or later, where this vulnerability is fixed. Since this is a self-hosted product, administrators should apply the official update to remediate the issue. No alternative mitigations are specified.

Description

OpenProject is open-source, web-based project management software. Prior to 17.4.0, OpenProject's rich text (markdown) rendering pipeline uses Sanitize::Config::RELAXED[:css] for inline style sanitization. This configuration permits essentially all CSS properties in style attributes on permitted HTML elements (figure, img, table, th, tr, td). This allows any authenticated user with write access to formattable text fields (work package descriptions, comments, project descriptions, news) to inject CSS This vulnerability is fixed in 17.4.0.

References

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