CVE-2026-27333: Paid Videochat Deserialization Flaw

CVE-2026-27333 Overview

CVE-2026-27333 is an unauthenticated deserialization of untrusted data vulnerability affecting the Paid Videochat Turnkey Site WordPress plugin (ppv-live-webcams) in versions up to and including 7.3.23. The flaw is classified under [CWE-502: Deserialization of Untrusted Data]. An unauthenticated remote attacker can supply crafted serialized objects that the plugin processes without validation. Successful exploitation can lead to arbitrary code execution, data tampering, or service disruption on the affected WordPress site.

Critical Impact
Unauthenticated attackers can trigger PHP object injection against vulnerable WordPress sites, potentially achieving remote code execution and full compromise of confidentiality, integrity, and availability.

Affected Products

Paid Videochat Turnkey Site WordPress plugin (ppv-live-webcams) versions <= 7.3.23
WordPress sites with the plugin installed and enabled
Hosting environments serving the plugin without an active virtual patch

Discovery Timeline

2026-06-15 - CVE-2026-27333 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-27333

Vulnerability Analysis

The vulnerability stems from insecure deserialization within the Paid Videochat Turnkey Site plugin. The plugin passes attacker-controllable input into a PHP deserialization routine without validating the source or structure of the data. In PHP, deserialization of attacker-controlled strings triggers magic methods such as __wakeup, __destruct, and __toString on instantiated objects.

When a vulnerable WordPress site contains usable gadget chains in loaded plugins, themes, or the WordPress core, an attacker can chain these magic methods to execute arbitrary PHP code. The attack does not require authentication or user interaction, which broadens the exposure to any internet-facing site running the plugin. The CWE-502 classification confirms that the root issue is unsafe handling of serialized object input.

Root Cause

The plugin calls unserialize() (or an equivalent deserialization function) on data that originates from untrusted HTTP request parameters. There is no allowlist of expected classes, no integrity check such as an HMAC, and no use of safer formats like JSON. This pattern allows arbitrary PHP object instantiation directly from network input.

Attack Vector

The attack vector is network-based and requires no privileges or user interaction. An attacker submits a crafted HTTP request containing a serialized PHP payload to a vulnerable plugin endpoint. The plugin deserializes the payload, instantiating attacker-chosen classes and triggering gadget chains that lead to file writes, command execution, or data exfiltration. See the Patchstack WordPress Vulnerability Report for advisory details.

Detection Methods for CVE-2026-27333

Indicators of Compromise

HTTP requests to ppv-live-webcams plugin endpoints containing serialized PHP markers such as O:, a:, or s: followed by class names and lengths.
Unexpected PHP files created in wp-content/uploads/ or plugin directories after requests to the plugin.
New or modified administrator accounts and unscheduled WP-Cron entries originating from anonymous sessions.
Outbound connections from the web server process (php-fpm, apache2) to unfamiliar hosts shortly after plugin requests.

Detection Strategies

Inspect web server and WAF logs for POST or GET parameters carrying base64-encoded or raw serialized PHP payloads targeting plugin routes.
Hunt for anomalous PHP processes spawning shell utilities such as sh, bash, wget, or curl from the web server user context.
Correlate plugin endpoint access with subsequent file system writes inside the WordPress document root.

Monitoring Recommendations

Enable file integrity monitoring on wp-content/plugins/ppv-live-webcams/ and the WordPress core directories.
Forward web server, PHP error, and WordPress audit logs to a centralized analytics platform for retention and search.
Alert on first-seen User-Agents posting to the plugin and on any request body containing serialized object signatures.

How to Mitigate CVE-2026-27333

Immediate Actions Required

Update the Paid Videochat Turnkey Site plugin to a version newer than 7.3.23 once the vendor publishes a fixed release.
If no patched version is available, deactivate and remove the ppv-live-webcams plugin from production sites.
Restrict access to plugin endpoints at the WAF or reverse proxy layer until remediation is confirmed.
Rotate WordPress administrator credentials, secret keys, and database passwords if exploitation is suspected.

Patch Information

Review the Patchstack WordPress Vulnerability Report for the current patch status. Patchstack offers virtual patching for sites that cannot upgrade immediately. Verify the installed plugin version with wp plugin list after applying any update.

Workarounds

Deploy a WAF rule that blocks request bodies containing PHP serialized object signatures such as O:\d+:".
Disable the plugin until a fixed release is verified, particularly on internet-facing WordPress instances.
Apply least-privilege file system permissions so the web server user cannot write to plugin and theme directories.
Use PHP disable_functions to remove dangerous functions like exec, system, and passthru where the application does not require them.

bash

# Configuration example
# Disable the vulnerable plugin via WP-CLI until a patched version is installed
wp plugin deactivate ppv-live-webcams
wp plugin list --name=ppv-live-webcams --fields=name,status,version

# Example ModSecurity rule to block PHP serialized object payloads
SecRule REQUEST_BODY "@rx O:[0-9]+:\"[A-Za-z0-9_\\\\]+\":" \
  "id:1027333,phase:2,deny,status:403,log,msg:'CVE-2026-27333 PHP object injection attempt'"