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Medium, CVSS 6.1

Silverstripe Cross-site scripting vulnerability in VersionedRequestFilter

GHSA-mpqj-f4v3-334h

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (silverstripe/framework 3.4.1, 3.3.3), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

A cross-site scripting vulnerability in VersionedRequestFilter has been found. If an incoming user request should not be able to access the requested stage, an error message is created for display on the CMS login page that they are redirected to. In this error message, the URL of the requested page is interpolated into the error message without being escaped; hence, arbitrary HTML can be injected into the CMS login page.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-mpqj-f4v3-334h

Agent brief

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# Patch Next advisory brief: GHSA-mpqj-f4v3-334h

Advisory: Silverstripe Cross-site scripting vulnerability in VersionedRequestFilter
IDs: GHSA-mpqj-f4v3-334h
Record: https://patchnext.com/advisories/ghsa-mpqj-f4v3-334h (revision 1, source checked 26 Oct 2026, 14:24 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: silverstripe/framework 3.4.1, 3.3.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist silverstripe/framework: affected >= 3.3.2, < 3.3.3; >= 3.4.0, < 3.4.1; fixed in 3.3.3, 3.4.1

## Suggested inspection (read-only)
- Packagist silverstripe/framework: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on silverstripe/framework.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-mpqj-f4v3-334h (GitHub-reviewed advisory GHSA-mpqj-f4v3-334h lists affected ranges: Packagist silverstripe/framework >=3.3.2 =3.4.0 <3.4.1)

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