CVE-2026-30587 Seafile Server has multiple stored XSS vulnerabilities
Authenticated attackers can inject malicious JavaScript via unsanitized WebSocket messages in the Seadoc editor, potentially leading to code execution or account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-30587?
CVE-2026-30587 is a medium-severity cross-site scripting vulnerability in n/a, published on 25 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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
Weakness: CWE-79
Which versions are affected by CVE-2026-30587?
4 open source packages ship an affected version, including @seafile/sdoc-editor. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@seafile/sdoc-editor npm | All versions | 2.0.209 |
@seafile/sdoc-editor npm | All versions | 2.0.209 |
@seafile/sdoc-editor npm | From 3.0.0 | 3.0.75 |
@seafile/sdoc-editor npm | From 3.0.0 | 3.0.75 |
Products include Seafile Seafile Server.
How do I fix CVE-2026-30587?
Upgrade @seafile/sdoc-editor to a fixed version for your release line: 2.0.209 or 3.0.75.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-30587 being exploited?
There is no known exploitation of CVE-2026-30587 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-rqj3-x344-qvxc.