CVE-2026-55779: Silverstripe Silverstripe-Versioned

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

Silverstripe Versioned provides versioning for Silverstripe models. Prior to 3.2.1, RestoreAction::getRestoreMessage() in src/RestoreAction.php builds ArchiveAdmin restore notifications rendered as CAST_HTML and inserts $restoredItem->Title, $restoredItem->URLSegment, $restoredItem->CMSEditLink(), and $changedProperty['value'] without applying Convert::raw2xml(). When an administrator restores an archived page containing a crafted title or URL segment, the generated restoration message can execute stored JavaScript in the administrator's browser, compromising the confidentiality and integrity of the CMS session. This issue is fixed in version 3.2.1.

Affected products

• Silverstripe Silverstripe-Versioned: before 3.2.1 (fixed in 3.2.1)

Published 2026-08-28. Last modified 2026-09-09.