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

Quick assessment

Affected
ether etherpad
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

etherpad是ETHER组织的一个支持多人实时在线协作的文档编辑工具。 ETHER etherpad 3.3.1之前版本存在跨站脚本漏洞，该漏洞源于对编号列表start属性的错误插值以及攻击者控制的属性池值，可能导致跨站脚本攻击。

CVSS 9.6 · Critical EPSS 0.47% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
ether etherpad < 3.3.1 affected
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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
Vulnerability Title
ETHER etherpad 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
etherpad是ETHER组织的一个支持多人实时在线协作的文档编辑工具。 ETHER etherpad 3.3.1之前版本存在跨站脚本漏洞，该漏洞源于对编号列表start属性的错误插值以及攻击者控制的属性池值，可能导致跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ether etherpad < 3.3.1 -

II. Public POCs for CVE-2026-55085

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6587 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
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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-2026-55089 9.9 CRITICAL Etherpad: JWT `admin` claim presence-only check lets non-admin OAuth users invoke every Et
CVE-2026-55088 6.8 MEDIUM Etherpad: Device-to-device author-token transfer endpoint is replayable, never expires, an
CVE-2026-55087 6.1 MEDIUM Etherpad: x-proxy-path header reflected into admin HTML/JS/CSS (cache-poisoning XSS) and c
CVE-2026-55090 5.3 MEDIUM Etherpad: Stored XSS in HTML export via unescaped attribute-pool values
CVE-2026-55086 4.2 MEDIUM Etherpad: 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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