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CVE-2026-30587

8.7 · HIGH

Multiple Stored XSS vulnerabilities exist in Seafile Server version 13.0.15,13.0.16-pro,12.0.14 and prior and fixed in 13.0.17, 13.0.17-pro, and 12.0.20-pro, via the Seadoc (sdoc) editor.

Published Mar 25, 2026CWE-79EPSS 0.46%

Overview

CVE-2026-30587 is a high-severity vulnerability. It was published on March 25, 2026 and has a CVSS 3.1 base score of 8.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Multiple Stored XSS vulnerabilities exist in Seafile Server version 13.0.15,13.0.16-pro,12.0.14 and prior and fixed in 13.0.17, 13.0.17-pro, and 12.0.20-pro, via the Seadoc (sdoc) editor. The application fails to properly sanitize WebSocket messages regarding document structure updates. This allows authenticated remote attackers to inject malicious JavaScript payloads via the src attribute of embedded Excalidraw whiteboards or the href attribute of anchor tags

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

GitHubgist.github.com/gabdevele/1b7e30ab367b26042fa32f45aa12ce2fGitHubgithub.com/haiwen/seadoc-editor/commit/8fa988aaede072b2ae073d1b2edcb2fc691423b2GitHubgithub.com/haiwen/seahub/commit/4c5301747bdb84c64b2f2b3230417df2d1cc8987Refmanual.seafile.com/12.0/changelog/changelog-for-seafile-professional-server/Refmanual.seafile.com/13.0/changelog/changelog-for-seafile-professional-server/Refmanual.seafile.com/13.0/changelog/server-changelog/

How CyberStrike helps

Frequently asked questions

What is CVE-2026-30587?

CVE-2026-30587 is a high-severity vulnerability. It was published on March 25, 2026 and has a CVSS 3.1 base score of 8.7 (HIGH).

How severe is CVE-2026-30587?

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-30587?

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-2026-30587?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-30587 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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