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CVE-2026-55086

4.2 · MEDIUM

Etherpad is a real-time collaborative editor.

Published Aug 19, 2026CWE-59EPSS 0.14%

Overview

CVE-2026-55086 is a medium-severity vulnerability. It was published on August 19, 2026 and has a CVSS 3.1 base score of 4.2 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.2, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d996GitHubgithub.com/ether/etherpad/pull/7784GitHubgithub.com/ether/etherpad/releases/tag/v3.1.0GitHubgithub.com/ether/etherpad/security/advisories/GHSA-2jwf-f4xq-f24hGitHubgithub.com/ether/etherpad/security/advisories/GHSA-2jwf-f4xq-f24h

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55086?

CVE-2026-55086 is a medium-severity vulnerability. It was published on August 19, 2026 and has a CVSS 3.1 base score of 4.2 (MEDIUM).

How severe is CVE-2026-55086?

This vulnerability has a CVSS 3.1 base score of 4.2, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-55086?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55086?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55086 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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