{"id":"CVE-2026-55090","title":"Etherpad is a real-time collaborative editor","summary":"Etherpad is a real-time collaborative editor. Prior to 3.3.0, getHTMLFromAtext in src/node/utils/ExportHtml.ts interpolates values from the exportHtmlAdditionalTagsWithData plugin hook into span data attributes without HTML attribute esc…","severity":"high","cwe":["CWE-79"],"vendor":"ep_etherpad-lite","product":"ep_etherpad-lite","affected":["ep_etherpad-lite <= 1.8.14"],"patched":["ep_etherpad-lite 3.3.0"],"published":"2026-08-19","updated":"2026-09-09","sourceUpdated":"2026-09-09T21:15:59.613","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55090","references":[{"url":"https://github.com/ether/etherpad/commit/86c56cf827dd6e5ff1b6cd3760f87adc47f58bb1","label":"security-advisories@github.com"},{"url":"https://github.com/ether/etherpad/pull/7905","label":"security-advisories@github.com"},{"url":"https://github.com/ether/etherpad/releases/tag/v3.3.0","label":"security-advisories@github.com"},{"url":"https://github.com/ether/etherpad/security/advisories/GHSA-2jp7-wwpg-3p9w","label":"security-advisories@github.com"},{"url":"https://github.com/ether/etherpad/releases/tag/3.3.0"},{"url":"https://github.com/advisories/GHSA-2jp7-wwpg-3p9w"}],"tags":["nvd","ghsa","npm"],"epss":0.00413,"epssPercentile":0.35313,"aliases":["GHSA-2jp7-wwpg-3p9w"],"ecosystem":"npm","ingestedAt":"2026-08-17T17:58:10.255Z","slug":"CVE-2026-55090","body":"## Overview\n\nEtherpad is a real-time collaborative editor. Prior to 3.3.0, getHTMLFromAtext in src/node/utils/ExportHtml.ts interpolates values from the exportHtmlAdditionalTagsWithData plugin hook into span data attributes without HTML attribute escaping. A pad editor can place an attacker-controlled value into the attribute pool through moveOpsToNewPool and AttributePool.putAttrib. When a bundled plugin such as ep_font_color or ep_font_size registers the hook, opening the resulting HTML export causes the value to execute as stored cross-site scripting in the Etherpad origin. This issue is fixed in version 3.3.0.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-55090)\n\nAffected packages:\n\n- `ep_etherpad-lite <= 1.8.14`\n\nPatched in:\n\n- `ep_etherpad-lite 3.3.0`\n\nSource: https://github.com/advisories/GHSA-2jp7-wwpg-3p9w","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}