CVE-2020-8035
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 · uneditedThe image view functionality in Horde Groupware Webmail Edition before 5.2.22 is affected by a stored Cross-Site Scripting (XSS) vulnerability via an SVG image upload containing a JavaScript payload. An attacker can obtain access to a victim's webmail account by making them visit a malicious URL.
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 confidenceA stored Cross-Site Scripting (XSS) vulnerability in Horde Groupware Webmail Edition's image view functionality allows attackers to upload SVG files containing embedded JavaScript payloads. When users view these malicious SVG images, the JavaScript executes in their browser context, enabling session hijacking and account takeover.
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< 5.2.22CVSS 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 Horde Groupware installationLocate the Horde installation directory and check for the version file, typically found in the Horde root directory as version.php or in the documentation/config files. Check package.json, lib/version.php, or the admin interface for version information.Affected if Horde Groupware Webmail Edition is installed and the version is below 5.2.22
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Confirm image upload functionality is accessibleLog into the Horde Webmail interface and navigate to the compose email or file attachment feature. Attempt to access the image/file upload functionality to verify it is enabled for users.Affected if The image upload and viewing functionality is enabled and accessible to users
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Verify SVG upload capabilityAttempt to upload an SVG file through the compose/attachment interface, or inspect the application's file type upload restrictions in the configuration settings under the file upload or attachment settings.Affected if SVG file uploads are permitted by the application configuration and not blocked at the server level
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Check if image viewing feature is activeNavigate to an uploaded image or attachment and view it through the image viewer functionality. Confirm that SVG files render inline or through an img tag in the browser.Affected if SVG files render in the browser context through the image viewer, allowing script execution potential
A user is affected if Horde Groupware Webmail Edition version is below 5.2.22 AND the image/file upload and viewing functionality is enabled, as this combination allows stored XSS via malicious SVG uploads.
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 data5.2.22
Upgrade to Horde Groupware Webmail Edition 5.2.22 or later, which implements proper sanitization of uploaded SVG files to strip or neutralize embedded JavaScript code.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 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 $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-8035 — 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-2020-8035 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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