CVE-2026-55085

CriticalCVSS 9.6/10Last modified Sep 9, 2026

Description

Etherpad is a real-time collaborative editor. Prior to 3.3.1, result.appendSpan in src/static/js/domline.ts interpolates the start attribute of a numbered list directly into an unquoted ol start attribute before assigning the generated markup to node.innerHTML. ImportEtherpad.setPadRaw in src/node/utils/ImportEtherpad.ts accepts attacker-controlled attribute-pool values from a crafted .etherpad import, including list:number1 and a malicious start value. Any user with write access to a pad can store markup that executes as cross-site scripting when another user opens the pad or /timeslider, including when an administrator views the pad. This issue is fixed in version 3.3.1.

Metrics

CVSS 3.1 9.6/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
ether	etherpad	< 3.3.1

References

Timeline

Published: Aug 19, 2026
Last modified: Sep 9, 2026
NVD status: Deferred

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