CVE-2026-55779Network attack vector

Stored XSS via unescaped restore message content

Published Aug 28, 2026 · Updated Aug 28, 2026

Stored XSS in Silverstripe Versioned before 3.2.1 allows remote authenticated users to execute JavaScript in a restoring administrator's browser. RestoreAction::getRestoreMessage() inserts the restored title, URL segment, edit link, and changed value into a CAST_HTML notification without raw2xml escaping. Exploitation requires permission to plant crafted archived content and another user to restore it, exposing that CMS session's confidentiality and integrity.

CVSS severity5.4
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Silverstripe Versioned before 3.2.1 allows remote authenticated users to execute JavaScript in a restoring administrator's browser. RestoreAction::getRestoreMessage() inserts the restored title, URL segment, edit link, and changed value into a CAST_HTML notification without raw2xml escaping. Exploitation requires permission to plant crafted archived content and another user to restore it, exposing that CMS session's confidentiality and integrity.

The record

CVE
CVE-2026-55779
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
Silverstripe
Product
Silverstripe Versioned
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Silverstripe · Silverstripe Versionedversion=< 3.2.1

Published CVSS scores

5.4GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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