CVE-2026-55090: Ether Etherpad

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Ether Etherpad: before 3.3.0 (fixed in 3.3.0)

Published 2026-08-19. Last modified 2026-09-09.