CVE-2017-20027
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 vulnerability was found in HumHub up to 1.0.1 and classified as problematic. Affected by this issue is some unknown functionality. The manipulation leads to cross site scripting (DOM). The attack may be launched remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 1.1.1 is able to address this issue. It is recommended to upgrade the affected component.
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 DOM-based cross-site scripting (XSS) vulnerability exists in HumHub up to version 1.0.1. DOM-based XSS occurs when client-side JavaScript manipulates the Document Object Model using untrusted input without proper sanitization, allowing attackers to inject malicious scripts that execute in victims' browsers.
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< 1.1.1CVSS 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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Determine installed HumHub versionCheck the version file or administrative interface for the running HumHub installation. Common locations include the admin dashboard 'About' section or the protected/config/version.php file.Affected if The installed version is 1.0.1 or lower, or any version prior to 1.1.1.
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Verify version is within affected rangeCompare the identified version against the affected range of HumHub versions less than 1.1.1.Affected if The version number is less than 1.1.1.
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Identify client-side input handlingReview the HumHub JavaScript files and any modules that process URL parameters, cookies, or DOM elements using user-supplied data without sanitization.Affected if The application processes untrusted input in the DOM without proper output encoding, allowing script injection.
You are affected if your HumHub installation version is less than 1.1.1 and processes user input in the DOM without 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.
dbcve · scoped1.1.1
Upgrade HumHub to version 1.1.1 or later to remediate this DOM-based XSS vulnerability.
1.1.1
- 1. Back up your HumHub database and file system before proceeding with the upgrade
- 2. Ensure you have sufficient disk space and appropriate server permissions
- 3. Download HumHub version 1.1.1 from the official HumHub repository or website
- 4. Extract the new version files to your web server, replacing the existing installation
- 5. Run any database migration scripts included in the 1.1.1 release
- 6. Clear any application caches to ensure new files are loaded
- 7. Verify the installation by accessing the HumHub application
- 8. Test that the application functions normally after the upgrade
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-20027 — 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-2017-20027 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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