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CVE-2026-30587

Seafile Server cross-site scripting (XSS)

8.7 HIGHPublic exploitEPSS 0.46%
  1. Published25 Mar 2026

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Affected products

Seafile Server13.0.15 · 13.0.16 · < 12.0.20

Remediation

Fixed in
Seafile Server≥ 12.0.20

References

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Frequently asked

Is CVE-2026-30587 being actively exploited?

CVE-2026-30587 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.46%.

How severe is CVE-2026-30587?

CVE-2026-30587 has a CVSS 3.1 base score of 8.7, rated high. EPSS estimates a 0.46% probability of exploitation.

Which products are affected by CVE-2026-30587?

Affected products include Seafile Server.

How do I fix CVE-2026-30587?

Upgrade affected software to a fixed version, for example Seafile Server 12.0.20 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-30587 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.