{"id":"CVE-2026-52781","aliases":["EUVD-2026-39871","GHSA-q33w-f822-hg8x"],"status":"published","title":"OpenProject: Stored XSS on openproject.example.com through /api/v3/projects/{project}/work_packages via POST parameter \"description\"","description":"OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, the HTML sanitizer grants \u003cmacro\u003e 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.","severity":{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00251,"percentile":0.16627,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-06-26T19:00:10Z","modified":"2026-10-28T02:30:52Z","products":[{"vendor":"opf","product":"openproject"}],"references":[{"url":"https://github.com/opf/openproject/security/advisories/GHSA-q33w-f822-hg8x","tags":["x_refsource_CONFIRM","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52781.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52781","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-52781","title":"OpenProject: Stored XSS on openproject.example.com through /api/v3/projects/{project}/work_packages via POST parameter \"description\"","description":"OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, the HTML sanitizer grants \u003cmacro\u003e 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.","status":"published","published":"2026-06-26T19:00:10.717Z","modified":"2026-06-29T13:24:43.334Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:40:57.334596Z"}],"euvd":[{"id":"EUVD-2026-39871","description":"OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, the HTML sanitizer grants \u003cmacro\u003e 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.","status":"published","published":"2026-06-26T19:00:10Z","modified":"2026-06-29T13:24:43Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T18:20:22.87152Z"}],"nvd":[{"id":"CVE-2026-52781","description":"OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, the HTML sanitizer grants \u003cmacro\u003e 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.","status":"published","published":"2026-06-26T20:17:18.613Z","modified":"2026-10-25T17:10:00.197Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:26.508751Z"}],"osv":[{"id":"CVE-2026-52781","title":"OpenProject: Stored XSS on openproject.example.com through /api/v3/projects/{project}/work_packages via POST parameter \"description\"","description":"OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, the HTML sanitizer grants \u003cmacro\u003e 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.","status":"published","published":"2026-06-26T19:00:10.717Z","modified":"2026-10-28T02:30:52.484438369Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:45:07.431113Z"}]}}