CVE-2026-30587

Name: CVE-2026-30587
Creator: NVD / NIST
Published: 2026-03-25T18:16:31.793+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.7/10EPSS 0.28%

Last modified Jun 17, 2026

CVE-2026-30587 is a high-severity vulnerability rated 8.7/10 on the CVSS scale. 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. EPSS estimates a 0.28% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

8.7/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

EPSS Probability

0.28%

19.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Seafile	Seafile Server	< 12.0.20
Seafile	Seafile Server	13.0.15
Seafile	Seafile Server	13.0.16

References

https://gist.github.com/gabdevele/1b7e30ab367b26042fa32f45aa12ce2fExploit, Third Party Advisory
https://github.com/haiwen/seadoc-editor/commit/8fa988aaede072b2ae073d1b2edcb2fc691423b2Patch
https://github.com/haiwen/seahub/commit/4c5301747bdb84c64b2f2b3230417df2d1cc8987Patch
https://manual.seafile.com/12.0/changelog/changelog-for-seafile-professional-server/Release Notes
https://manual.seafile.com/13.0/changelog/changelog-for-seafile-professional-server/Release Notes
https://manual.seafile.com/13.0/changelog/server-changelog/Release Notes

Timeline

Published: Mar 25, 2026
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-30587?

How severe is CVE-2026-30587?

CVE-2026-30587 has a CVSS score of 8.7/10 (HIGH severity). The EPSS model estimates a 0.28% probability of exploitation in the next 30 days.

How do I fix CVE-2026-30587?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-30587?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST