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CVE-2026-55088— Etherpad: Device-to-device author-token transfer endpoint is replayable, never expires, and exposes the cleartext author token

Quick assessment

Affected
ether etherpad
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 2.6.0版本至3.1.0之前版本存在安全漏洞，该漏洞源于tokenTransfer接口未对令牌兑换进行过期检查和一次性使用校验，并在响应中返回原始作者令牌，可能导致未经身份验证的攻击者获取transfer UUID后重复兑换，读取明文令牌并冒充作者进行文档读写操作。

CVSS 6.8 · Medium EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1078.001 · Default Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
ether etherpad >= 2.6.0, < 3.1.0 affected
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I. Basic Information for CVE-2026-55088

Vulnerability Information
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Vulnerability Title
Etherpad: Device-to-device author-token transfer endpoint is replayable, never expires, and exposes the cleartext author token
Source: CVE Program / CVE List V5
Vulnerability Description
Etherpad is a real-time collaborative editor. From 2.6.0 until 3.1.0, Etherpad's src/node/hooks/express/tokenTransfer.ts uses POST /tokenTransfer to store an author token for transfer between browsers and exposes it through GET /tokenTransfer/{uuid}. Although the record includes createdAt, the transfer has no expiration check, is not removed after successful redemption, and is returned by res.send(tokenData), including the raw author token. An unauthenticated attacker who obtains a transfer UUID can repeatedly redeem it, receive fresh author cookies, read the cleartext token, and impersonate the originating author for pad read and write operations. This issue is fixed in version 3.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
ETHER etherpad 信息泄露漏洞
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 2.6.0版本至3.1.0之前版本存在安全漏洞，该漏洞源于tokenTransfer接口未对令牌兑换进行过期检查和一次性使用校验，并在响应中返回原始作者令牌，可能导致未经身份验证的攻击者获取transfer UUID后重复兑换，读取明文令牌并冒充作者进行文档读写操作。
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 >= 2.6.0, < 3.1.0 -

II. Public POCs for CVE-2026-55088

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III. Intelligence Information for CVE-2026-55088

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Patches & Fixes for CVE-2026-55088 (1)

Vendor Advisories for CVE-2026-55088 (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-2026-55085 9.6 CRITICAL Etherpad: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripti
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-200

V. Comments for CVE-2026-55088

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