Stored XSS via unchecked Seadoc URLs
Published Mar 25, 2026 · Updated Mar 25, 2026
Stored XSS in Seadoc in Seafile Server 13.0.15, 13.0.16-pro, and 12.0.14 and earlier allows remote authenticated users to execute JavaScript. WebSocket document-structure updates reach link and whiteboard renderers without URL validation, so hostile href values become clickable links and hostile src values become iframe sources. A signed-in attacker must save the payload in a shared Seadoc document, and a victim must render or follow the injected content; the script then runs in the victim's browser context.
Summary
What happened
Stored XSS in Seadoc in Seafile Server 13.0.15, 13.0.16-pro, and 12.0.14 and earlier allows remote authenticated users to execute JavaScript. WebSocket document-structure updates reach link and whiteboard renderers without URL validation, so hostile href values become clickable links and hostile src values become iframe sources. A signed-in attacker must save the payload in a shared Seadoc document, and a victim must render or follow the injected content; the script then runs in the victim's browser context.
The record
- CVE
- CVE-2026-30587
- Published
- Mar 25, 2026
- Updated
- Mar 25, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 25, 2026CVE publishedPublication date reported by the CVE source.
- Mar 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Public proof of concept for stored Seadoc XSSproof of concept · unverified
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Technologies
Your stack
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Your stack
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