Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-55086— Etherpad: Import/export use Math.random() for temp file paths; predictable paths on shared /tmp enable symlink-based file overwrite

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 3.1.0之前版本存在安全漏洞，该漏洞源于src/node/handler/ImportHandler.ts和src/node/handler/ExportHandler.ts使用Math.random()生成临时文件名并放在共享可写临时目录中，本地无特权攻击者预测文件名后可预创建符号链接，使后续导入或导出操作通过fs.writeFile、fs.rename或文档转换输出覆盖Etherpad进程可写的

CVSS 4.2 · Medium EPSS 0.14% · P4

Possible ATT&CK Techniques 2 AI

T1076 T1564.004 · NTFS File Attributes

Affected Version Matrix 1

VendorProduct Version RangeStatus
ether etherpad < 3.1.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-55086

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Etherpad: Import/export use Math.random() for temp file paths; predictable paths on shared /tmp enable symlink-based file overwrite
Source: CVE Program / CVE List V5
Vulnerability Description
Etherpad is a real-time collaborative editor. Prior to 3.1.0, src/node/handler/ImportHandler.ts and src/node/handler/ExportHandler.ts derive temporary filenames from Math.random() and place them in os.tmpdir(). On a host with a shared world-writable temporary directory, a local unprivileged attacker who predicts a filename can precreate a symbolic link to a file writable by the Etherpad process. Subsequent import or export operations can follow the link through fs.writeFile, fs.rename, or document-conversion output and overwrite the target with partially attacker-controlled content. This issue is fixed in version 3.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
ETHER etherpad 资源管理错误漏洞
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 3.1.0之前版本存在安全漏洞，该漏洞源于src/node/handler/ImportHandler.ts和src/node/handler/ExportHandler.ts使用Math.random()生成临时文件名并放在共享可写临时目录中，本地无特权攻击者预测文件名后可预创建符号链接，使后续导入或导出操作通过fs.writeFile、fs.rename或文档转换输出覆盖Etherpad进程可写的
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 < 3.1.0 -

II. Public POCs for CVE-2026-55086

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-55086

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-55086 (1)

Vendor Advisories for CVE-2026-55086 (1)

Vendor Pages for CVE-2026-55086 (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-2026-55088 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

IV. Related Vulnerabilities

Same product: etherpad
Same vendor: ether
Same weakness: CWE-59

V. Comments for CVE-2026-55086

No comments yet

Leave a comment