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CVE-2026-55085— Etherpad: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in etherpad-lite

CVSS 9.6 · Critical EPSS 0.36% · P30

Affected Version Matrix 1

VendorProductVersion RangeStatus
etheretherpad< 3.3.1affected
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I. Basic Information for CVE-2026-55085

Vulnerability Information
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Vulnerability Title
Etherpad: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in etherpad-lite
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
etheretherpad < 3.3.1 -

II. Public POCs for CVE-2026-55085

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 6587 chars
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III. Intelligence Information for CVE-2026-55085

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Patches & Fixes for CVE-2026-55085 (2)

Vendor Advisories for CVE-2026-55085 (1)

Vendor Pages for CVE-2026-55085 (1)

Same Patch Batch · ether · 2026-08-19 · 6 CVEs total

CVE-2026-550899.9 CRITICALEtherpad: JWT `admin` claim presence-only check lets non-admin OAuth users invoke every Et
CVE-2026-550886.8 MEDIUMEtherpad: Device-to-device author-token transfer endpoint is replayable, never expires, an
CVE-2026-550876.1 MEDIUMEtherpad: x-proxy-path header reflected into admin HTML/JS/CSS (cache-poisoning XSS) and c
CVE-2026-550905.3 MEDIUMEtherpad: Stored XSS in HTML export via unescaped attribute-pool values
CVE-2026-550864.2 MEDIUMEtherpad: Import/export use Math.random() for temp file paths; predictable paths on shared

IV. Related Vulnerabilities

Same product: etherpad
Same vendor: ether
Same weakness: CWE-79

V. Comments for CVE-2026-55085

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