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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2026-57744

CRITICAL · 9.8 CVSS v3.1 Published 2026-07-13
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click 5 weeks old

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
Deserialization of Untrusted Data vulnerability in stmcan RT-Theme 18 | Extensions rt18-extensions allows Object Injection.This issue affects RT-Theme 18 | Extensions: from n/a through <= 2.5.

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

The vulnerability is a deserialization flaw in the RT-Theme 18 extensions plugin that allows attackers to inject malicious serialized objects. Due to unsafe deserialization of untrusted data, an attacker can potentially instantiate arbitrary objects, leading to remote code execution or other advanced attacks depending on available PHP gadget chains in the application.

MitigationUpgrade to a patched version of RT-Theme 18 Extensions; if unavailable, avoid deserializing data from untrusted sources and implement class allowlisting for any remaining deserialization operations.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 RT-Theme 18 installation
    Check your web server file system for the presence of the RT-Theme 18 theme directory, typically found in wp-content/themes/rttheme18 or similar paths. Look for theme metadata files like style.css containing 'RT-Theme 18' or 'rt18' in the theme name.
    Affected if RT-Theme 18 is installed on the WordPress site
  2. Locate rt18-extensions plugin
    Search for the rt18-extensions plugin directory in wp-content/plugins/. Common paths include wp-content/plugins/rt18-extensions/ or similar naming conventions containing 'rt18-extensions'.
    Affected if The rt18-extensions plugin is present in the plugins directory
  3. Find unsafe unserialize calls
    Search the rt18-extensions plugin source files for the pattern unserialize( using grep or a file search tool. Inspect files that contain this pattern to determine if untrusted user input is passed to the unserialize() function.
    Affected if The plugin contains unserialize() calls processing data without prior validation
  4. Trace data source to unserialize
    Examine the identified unserialize() calls and trace back the data source. Check if the data originates from HTTP request parameters, POST/GET variables, cookies, or database values that could be controlled by an attacker.
    Affected if User-controlled data reaches the unserialize() function without sanitization
  5. Identify reachable magic methods
    Search the rt18-extensions plugin and RT-Theme 18 theme for PHP class definitions containing magic methods such as __destruct, __wakeup, __toString, or __invoke. These methods could be triggered during object injection.
    Affected if Classes with exploitable magic methods exist in the plugin or theme context

A user is affected if RT-Theme 18 with the rt18-extensions plugin is installed and the plugin contains unserialize() calls that process untrusted user input.

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 RT-Theme 18 Extensions; if unavailable, avoid deserializing data from untrusted sources and implement class allowlisting for any remaining deserialization operations.

Recommended fix Moderate confidence

Latest stable release of RT-Theme 18 (version > 2.5)

  1. Update RT-Theme 18 to the latest available version from the official source (themeforest.net or the theme developer's website)
  2. After updating, verify all extensions including rt18-extensions are also updated to their latest versions
  3. Clear any caching systems (server-side cache, CDN cache, browser cache) to ensure the patched code is served
  4. Review the theme's settings after update to ensure configuration integrity
Caveat Review theme changelog for any CSS/template changes that may require child theme adjustments

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

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,750
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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-2026-57744 in production — separate from our analysis above.

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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
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