dbcve.org
Z BlogphpApplication · Zblogcn

CVE-2020-29176

HIGH · 7.8 CVSS v3.1 Published 2021-12-02
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
81/100
Remediation priority · High
No privileges

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 · unedited
An arbitrary file upload vulnerability in Z-BlogPHP v1.6.1.2100 allows attackers to execute arbitrary code via a crafted JPG file.

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 confidence

Arbitrary file upload vulnerability in Z-BlogPHP v1.6.1.2100 allows attackers to upload crafted JPG files that can contain malicious code, leading to arbitrary code execution on the server. The application fails to properly validate file content and type before accepting and storing uploaded files.

MitigationUpgrade to a patched version of Z-BlogPHP and implement strict server-side file validation including MIME type checking and magic byte verification. Uploaded files should be stored outside the web root or have script execution disabled.

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
Z BlogphpApplication
Affected:= 1.6.1.2100

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
Local
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed Z-BlogPHP version
    Log into the admin dashboard and navigate to the About or System Information page to view the version number, or check the version file in the installation directory if accessible
    Affected if Installed version is exactly 1.6.1.2100
  2. Confirm file upload functionality is enabled
    Access the Z-BlogPHP admin panel and locate the media library or file upload feature, typically found in the post editor or upload management section
    Affected if File upload functionality is present and accessible to users or administrators
  3. Examine upload directory location
    Review Z-BlogPHP configuration settings for the upload path (commonly in zb_system/function/lib/app.php or config files), and check if the upload directory is located within the web root
    Affected if Uploaded files are stored in a directory accessible via web browser without script execution restrictions
  4. Check file type validation configuration
    Review Z-BlogPHP upload handling code and settings to determine if MIME type validation, magic byte verification, or content-type checking is implemented before file storage
    Affected if No server-side file content validation is performed and .jpg uploads can contain executable PHP code

Environment is affected if running Z-BlogPHP version 1.6.1.2100 with the file upload feature enabled and without proper content-type validation on uploaded files.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade to a patched version of Z-BlogPHP and implement strict server-side file validation including MIME type checking and magic byte verification. Uploaded files should be stored outside the web root or have script execution disabled.

Recommended fix Moderate confidence

Z-BlogPHP version newer than 1.6.1.2100 (latest stable release)

  1. 1. Navigate to the official Z-BlogPHP repository or download page at https://www.z-blogphp.com/
  2. 2. Download the latest stable version of Z-BlogPHP (version newer than 1.6.1.2100)
  3. 3. Before upgrading, perform a complete backup of your database and all website files
  4. 4. Review the release notes for the new version to understand any configuration changes needed
  5. 5. Follow the official upgrade instructions provided in the Z-BlogPHP documentation
  6. 6. After upgrading, verify that the file upload functionality works correctly and that the vulnerability is patched
Caveat Review release notes for any breaking changes between 1.6.1.2100 and the target version

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Z Blogphp Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
Get help mitigating

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2020-29176 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2020-29176 in production — separate from our analysis above.

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.

What this is

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.

What belongs here
  • 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