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

Q: How do I fix CVE-2026-30587?

seafile server: upgrade to 12.0.20. Exact commands for each OS are on this page.

Q: Is CVE-2026-30587 being exploited?

CVE-2026-30587 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-30587 affect?

CVE-2026-30587 affects seafile server. Severity is high (CVSS 8.7). 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

Q: How urgent is CVE-2026-30587?

Priority 41/100. High severity; Public exploit reference

This month

HIGH 8.7UPGRADE

CVE-2026-30587 is a high-severity flaw (CVSS 8.7) affecting seafile server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-03-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: seafile

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-25 18:16 UTCPublished CVE record published
2026-06-17 10:32 UTCUpdated Record last modified

seafile seafile server UPGRADE

Affected: < 12.0.20 · 13.0.15 · 13.0.16

Fixed in: 12.0.20

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy seafile-server || rpm -q seafile-server || seafile-server --version

2. UPGRADE to 12.0.20 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade seafile-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade seafile-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-30587?

seafile server: upgrade to 12.0.20. Exact commands for each OS are on this page.

Is CVE-2026-30587 being exploited?

CVE-2026-30587 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-30587 affect?

CVE-2026-30587 affects seafile server. Severity is high (CVSS 8.7). 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

How urgent is CVE-2026-30587?

Priority 41/100. High severity; Public exploit reference

References

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