XSS in Seafile Server
CVE-2026-30587
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
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.003 (20.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.
Affected products
- Seafile Seafile_server — versions 13.0.15, 13.0.16
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (Exploit, Third Party Advisory)
- cve@mitre.org (Release Notes)
- cve@mitre.org (Release Notes)
- cve@mitre.org (Release Notes)
- cve@mitre.org (Patch)
- cve@mitre.org (Patch)
Frequently asked questions
- What is CVE-2026-30587?
- CVE-2026-30587 is a high-severity vulnerability in Seafile Server, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-03-25.
- How severe is CVE-2026-30587?
- High severity. CVSS v3 base score is 8.7 out of 10.