CVE-2020-9311
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 · uneditedIn SilverStripe through 4.5, malicious users with a valid Silverstripe CMS login (usually CMS access) can craft profile information which can lead to XSS for other users through specially crafted login form URLs.
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 confidenceStored XSS vulnerability in SilverStripe CMS through version 4.5 where authenticated users with CMS access can inject malicious JavaScript through profile information that executes when other users view specially crafted login form URLs.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data>= 3.0.0, < 3.7.5CVSS 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
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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.
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Identify installed SilverStripe versionLocate the SilverStripe version file (usually version.php in the framework directory or check composer.json), or use the CMS admin panel's system information. Run: composer show silverstripe/framework 2>/dev/null or inspect the framework/composer.json file.Affected if The installed version is >= 3.0.0 and < 3.7.5 (versions 3.0.0 through 3.7.4 are affected)
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Confirm CMS access permissionsLog into the SilverStripe CMS with a standard authenticated user account and verify whether the user has access to edit profile or member information through the CMS admin interface (typically under the 'Security' section or 'My Profile' area).Affected if Authenticated users with CMS access can modify profile/member information fields
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Verify profile data rendering in login formsExamine the login form templates and controllers (usually in framework/templates or app/templates) to determine if user profile fields (such as FirstName, Surname, or custom profile data) are rendered or displayed on the login page or during authentication.Affected if Login forms or related templates render user profile information without proper output encoding
You are affected if your SilverStripe version is between 3.0.0 and 3.7.5, and authenticated CMS users can inject script content into profile fields that get rendered in login form contexts.
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.
From vendor data3.7.5
Upgrade to SilverStripe 4.5 or later which contains the patched version. Apply proper output encoding for user profile data when rendering in login forms.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-9311 — 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-2020-9311 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
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- 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
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