CVE-2026-55086

Summary

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.

Affected Software

VendorProductVersion RangeStatus
etheretherpad< 3.1.0affected

Weaknesses

  • CWE-59: CWE-59: Improper Link Resolution Before File Access ('Link Following')
  • CWE-377: CWE-377: Insecure Temporary File

References