CVE-2026-52781

MediumCVSS 6.4/10Last modified Oct 25, 2026

Description

OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, the HTML sanitizer grants <macro> elements unrestricted data-* attributes via :data wildcard. An attacker injects data-controller="poll-for-changes" into a work package description, causing Stimulus.js to mount a controller that fetches an attacker-uploaded attachment and passes it to renderStreamMessage(). This executes arbitrary Turbo Stream actions — including redirect_to — in every victim's authenticated browser session, redirecting them to an attacker-controlled server. This vulnerability is fixed in 17.3.3 and 17.4.1.

Metrics

CVSS 3.1 6.4/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
opf	openproject	< 17.3.3; >= 17.4.0, < 17.4.1

References

https://github.com/opf/openproject/security/advisories/GHSA-q33w-f822-hg8x

Timeline

Published: Jun 26, 2026
Last modified: Oct 25, 2026
NVD status: Deferred

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