CVE-2021-39421
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 · uneditedA cross-site scripting (XSS) vulnerability in SeedDMS v6.0.15 allows attackers to execute arbitrary web scripts or HTML via a crafted payload.
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 · moderate confidenceA cross-site scripting (XSS) vulnerability in SeedDMS v6.0.15 allows attackers to inject malicious scripts or HTML through user-supplied input that is insufficiently sanitized before being rendered in the application's web pages.
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= 6.0.15CVSS 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
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/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 SeedDMS installationLocate the SeedDMS installation directory or check the application's version information file. Common locations include the root web directory or version documentation files.Affected if The installed version is exactly 6.0.15
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Confirm the exact version numberAccess the SeedDMS version information through the admin panel, look for a version.php or similar file in the installation, or check the software release notes.Affected if The running version is SeedDMS 6.0.15 and not a patched or different version
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Determine if the web interface is activeVerify that the SeedDMS web interface is accessible and running, as this XSS vulnerability affects web pages rendered by the application.Affected if The web interface is enabled and accessible to users or attackers
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Identify user input pointsReview forms, search fields, document metadata entries, or any feature that accepts user-supplied text input within the web application.Affected if User-supplied input can be submitted and displayed without proper sanitization in web pages
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Check for output encodingInspect how user input is handled before being rendered in HTML pages. Look for proper escaping or sanitization functions in the code that processes form submissions.Affected if User input is rendered in HTML without context-aware output encoding, allowing script injection
You are affected if running SeedDMS version 6.0.15 and the web application renders user-supplied input without sufficient sanitization.
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 dataImplement proper input validation and context-aware output encoding for all user-supplied data, and apply Content Security Policy headers to mitigate script execution risks.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-39421 — 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-2021-39421 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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