CVE-2026-55090
CVE-2026-55090 · Etherpad: Stored XSS in HTML export via unescaped attribute-pool values
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 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.
CVSS 5.3 · Medium · EPSS 0.5% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
etherpad
- Versions
- < 3.3.0: Affected
No fix published
ep_etherpad-lite npm
- Affected ranges
- SEMVER: < 3.3.0
Update to 3.3.0