Silverstripe Versioned CVE-2026-55779
MEDIUM
GHSA-m4g4-86qc-v8w7
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
PR:L because planting the stored payload requires authenticated CMS editor access; all other metrics align with vendor vector.
Primary rating from Vendor (https://github.com/silverstripe/silverstripe-versioned).
CVSS VectorVendor: https://github.com/silverstripe/silverstripe-versioned
Lifecycle Timeline
2DescriptionCVE.org
Impact
It's possible to use the page title as an XSS vector when restoring a page in ArchiveAdmin
Reporter
Steve Boyd Silverstripe Ltd.
AnalysisAI
Stored XSS in the silverstripe/versioned package allows a CMS user with content-creation rights to execute arbitrary JavaScript in an administrator's browser by embedding a malicious payload in a page title that is rendered without escaping during the ArchiveAdmin restore workflow. All versions prior to 3.2.1 are affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two chained conditions. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 3.1 score of 5.4 (Medium, AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N) may overstate exploitability via PR:N: the description and patch context indicate that an attacker must have at least CMS editor or author privileges to plant the malicious title, making PR:L more defensible. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade silverstripe/versioned to version 3.2.1 or later by running 'composer update silverstripe/versioned' and confirming the installed version resolves to 3.2.1. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
Leaving vuln.today