CVE-2026-55086
MEDIUM
4,2
Source: [email protected]
Attack Vector: local
Attack Complexity: high
Privileges Required: low
User Interaction: none
Scope: changed
Confidentiality: low
Integrity: low
Availability: none
Description
AI Translation Available
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.
59
Improper Link Resolution Before File Access ('Link Following')
DraftCommon Consequences
Security Scopes Affected:
Confidentiality
Integrity
Access Control
Other
Potential Impacts:
Read Files Or Directories
Modify Files Or Directories
Bypass Protection Mechanism
Execute Unauthorized Code Or Commands
Applicable Platforms
Operating Systems:
Windows, Unix
377
Insecure Temporary File
IncompleteCommon Consequences
Security Scopes Affected:
Confidentiality
Integrity
Potential Impacts:
Read Files Or Directories
Modify Files Or Directories
Applicable Platforms
All platforms may be affected
https://github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d9…
https://github.com/ether/etherpad/pull/7784
https://github.com/ether/etherpad/releases/tag/v3.1.0
https://github.com/ether/etherpad/security/advisories/GHSA-2jwf-f4xq-f24h