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MEDIUM severity

Seafile Server has multiple stored XSS vulnerabilitiesGHSA-rqj3-x344-qvxc

MEDIUMFix: haiwen/seadoc-editor@8fa988a

GHSA-rqj3-x344-qvxc is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in @seafile/sdoc-editor. A fix is available for @seafile/sdoc-editor — see the affected versions and patch details below.

Also known asCVE-2026-30587
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-rqj3-x344-qvxc.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs22th percentile — riskier than 22% of all scored CVEsHighest risk
0.00%0.32%0.64%0.95%0.1%0.3%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

2other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
@seafile/sdoc-editornpm
1Kdownloads / week

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.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
📦npm@seafile/sdoc-editor≥ 3.0.0&&< 3.0.753.0.75npm install @seafile/sdoc-editor@3.0.75
📦npm@seafile/sdoc-editorall versions2.0.209npm install @seafile/sdoc-editor@2.0.209

Affected Products

1 product · 3 configurations
Application
seafile serverseafile
< 12.0.20
2 versions
13.0.1513.0.16

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @seafile/sdoc-editor, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update @seafile/sdoc-editor to 3.0.75 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-rqj3-x344-qvxc is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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Seafile Server has multiple stored XSS vulnerabilities