{"id":"CVE-2026-104979","aliases":["EUVD-2026-92538","GHSA-hh2r-3hwp-mvq3"],"status":"published","title":"Plane: Cross-tenant stored XSS in intake enables account takeover","description":"Plane is an open-source project management tool. Prior to 1.4.0, IntakeIssuePublicViewSet.create in Plane v1.3.1 writes description_html through Issue.objects.create(...) without calling validate_html_content from nh3. Any authenticated user, including a new user with no workspace memberships, can plant arbitrary HTML in a project that has a published DeployBoard with intake enabled. When a project member or viewer of a closed intake item clicks the planted link, the TipTap \\tjavascript: parser bypass and the target=\"_self\" click handler execute JavaScript in the viewer's session and exfiltrate a long-lived API token. This issue is fixed in 1.4.0.","severity":{"version":"3.1","score":8.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00359,"percentile":0.30059,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79","CWE-862"],"published":"2026-10-05T17:49:53Z","modified":"2026-10-28T02:30:44Z","products":[{"vendor":"makeplane","product":"plane"}],"references":[{"url":"https://github.com/makeplane/plane/security/advisories/GHSA-hh2r-3hwp-mvq3","tags":["x_refsource_CONFIRM","exploit","advisory"]},{"url":"https://github.com/makeplane/plane/pull/9287","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/makeplane/plane/commit/0d58adb69d859fc94c43b9d68fadd77e810d5ed1","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/makeplane/plane/releases/tag/v1.4.0","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104979.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-104979","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-104979","title":"Plane: Cross-tenant stored XSS in intake enables account takeover","description":"Plane is an open-source project management tool. Prior to 1.4.0, IntakeIssuePublicViewSet.create in Plane v1.3.1 writes description_html through Issue.objects.create(...) without calling validate_html_content from nh3. Any authenticated user, including a new user with no workspace memberships, can plant arbitrary HTML in a project that has a published DeployBoard with intake enabled. When a project member or viewer of a closed intake item clicks the planted link, the TipTap \\tjavascript: parser bypass and the target=\"_self\" click handler execute JavaScript in the viewer's session and exfiltrate a long-lived API token. This issue is fixed in 1.4.0.","status":"published","published":"2026-10-05T17:49:53.03Z","modified":"2026-10-05T19:12:00.312Z","cvss":[{"version":"3.1","score":8.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-79","CWE-862"],"updated_at":"2026-11-02T14:20:09.448255Z"}],"euvd":[{"id":"EUVD-2026-92538","description":"Plane is an open-source project management tool. Prior to 1.4.0, IntakeIssuePublicViewSet.create in Plane v1.3.1 writes description_html through Issue.objects.create(...) without calling validate_html_content from nh3. Any authenticated user, including a new user with no workspace memberships, can plant arbitrary HTML in a project that has a published DeployBoard with intake enabled. When a project member or viewer of a closed intake item clicks the planted link, the TipTap \\tjavascript: parser bypass and the target=\"_self\" click handler execute JavaScript in the viewer's session and exfiltrate a long-lived API token. This issue is fixed in 1.4.0.","status":"published","published":"2026-10-05T17:49:53Z","modified":"2026-10-05T19:12:00Z","cvss":[{"version":"3.1","score":8.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T17:27:39.05741Z"}],"nvd":[{"id":"CVE-2026-104979","description":"Plane is an open-source project management tool. Prior to 1.4.0, IntakeIssuePublicViewSet.create in Plane v1.3.1 writes description_html through Issue.objects.create(...) without calling validate_html_content from nh3. Any authenticated user, including a new user with no workspace memberships, can plant arbitrary HTML in a project that has a published DeployBoard with intake enabled. When a project member or viewer of a closed intake item clicks the planted link, the TipTap \\tjavascript: parser bypass and the target=\"_self\" click handler execute JavaScript in the viewer's session and exfiltrate a long-lived API token. This issue is fixed in 1.4.0.","status":"published","published":"2026-10-05T18:17:33.42Z","modified":"2026-10-05T20:17:10.243Z","cvss":[{"version":"3.1","score":8.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-79","CWE-862"],"updated_at":"2026-11-02T14:12:54.129949Z"}],"osv":[{"id":"CVE-2026-104979","title":"Plane: Cross-tenant stored XSS in intake enables account takeover","description":"Plane is an open-source project management tool. Prior to 1.4.0, IntakeIssuePublicViewSet.create in Plane v1.3.1 writes description_html through Issue.objects.create(...) without calling validate_html_content from nh3. Any authenticated user, including a new user with no workspace memberships, can plant arbitrary HTML in a project that has a published DeployBoard with intake enabled. When a project member or viewer of a closed intake item clicks the planted link, the TipTap \\tjavascript: parser bypass and the target=\"_self\" click handler execute JavaScript in the viewer's session and exfiltrate a long-lived API token. This issue is fixed in 1.4.0.","status":"published","published":"2026-10-05T17:49:53.03Z","modified":"2026-10-28T02:30:44.519711998Z","cvss":[{"version":"3.1","score":8.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-79","CWE-862"],"updated_at":"2026-11-02T15:44:54.236592Z"}]}}