CVE-2026-54720
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedSilverstripe Framework is a PHP framework which powers the Silverstripe CMS. In versions prior to 6.2.2, the "Insert media from web" functionality in the CMS is vulnerable to XSS from a specially crafted embed. This issue was fixed in version 6.2.2/
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceCross-site scripting (XSS) vulnerability in Silverstripe CMS 'Insert media from web' functionality. Versions prior to 6.2.2 accept specially crafted embeds that can inject malicious scripts into the CMS interface.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
-
Identify Silverstripe CMS versionLocate the Silverstripe version file or check the framework version constant, typically found in the vendor directory or project metadataAffected if Installed version is earlier than 6.2.2 (e.g., 6.2.1, 6.2.0, or any 6.x version below 6.2.2)
-
Confirm CMS interface is accessibleVerify the Silverstripe admin interface is deployed and accessible in the environmentAffected if The CMS admin interface exists and is in use
-
Check Insert media from web feature statusInspect whether the media embedding functionality is enabled in the CMS configuration or available to content editorsAffected if The Insert media from web feature is enabled and accessible to users
-
Review embed content handlingExamine how the CMS processes embed URLs or media content in the Insert media from web functionalityAffected if The system processes external embed content without sanitization
The environment is affected if Silverstripe CMS version is below 6.2.2 AND the Insert media from web feature is enabled and accessible in the deployment
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedUpgrade Silverstripe Framework to version 6.2.2 or later to remediate this vulnerability.
6.2.2
- 1. Identify the current Silverstripe Framework version in use by checking your project's composer.json or vendor directory
- 2. Run `composer require silverstripe/framework:^6.2.2` to upgrade to the fixed version
- 3. Run `composer update silverstripe/framework` to apply the changes
- 4. Clear any cached files (e.g., remove `silverstripe-cache` directories and rebuild with `dev/build`flush=1)
- 5. Test the 'Insert media from web' functionality to confirm the XSS vulnerability is resolved
- 6. Verify the application still functions correctly after the upgrade
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,648.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-54720 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-54720 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data