CVE-2026-82226: Tickera PHP Object Injection Vulnerability

CVE-2026-82226 Overview

CVE-2026-82226 is an unauthenticated PHP Object Injection vulnerability in the Tickera event ticketing plugin for WordPress. The flaw affects Tickera versions up to and including 3.6.0.2. Attackers can trigger deserialization of untrusted input over the network without authentication or user interaction. The weakness is classified under CWE-502: Deserialization of Untrusted Data.

Critical Impact
Unauthenticated attackers can inject crafted PHP objects that, when combined with a suitable gadget chain, may lead to remote code execution, arbitrary file operations, or full site compromise.

Affected Products

Tickera Event Ticketing System plugin for WordPress
All plugin versions up to and including 3.6.0.2
WordPress sites running the vulnerable Tickera plugin

Discovery Timeline

2026-08-31 - CVE-2026-82226 published to NVD
2026-09-01 - Last updated in NVD database

Technical Details for CVE-2026-82226

Vulnerability Analysis

The Tickera plugin passes attacker-controlled input to a PHP deserialization sink without validation. PHP deserialization reconstructs objects from a serialized string and invokes magic methods such as __wakeup, __destruct, and __toString during reconstruction. When the input is user-controlled, an attacker can instantiate arbitrary classes present in the WordPress runtime.

Attack impact depends on gadget chains available in WordPress core, active plugins, or themes. Known gadget chains in the WordPress ecosystem have historically enabled file writes, SQL execution, and command execution. The unauthenticated attack surface removes the barrier of valid credentials, exposing the site to opportunistic scanning and mass exploitation.

Root Cause

The root cause is unsafe use of unserialize() (or an equivalent deserialization routine) on data reachable from an unauthenticated request path. The plugin does not enforce type constraints, integrity checks, or an allowlist of acceptable classes before deserialization. This aligns with CWE-502.

Attack Vector

Exploitation occurs over the network against public-facing WordPress endpoints exposed by the Tickera plugin. An attacker submits a serialized PHP payload through a request parameter or cookie that is later deserialized server-side. No prior authentication, elevated privilege, or user interaction is required. Refer to the Patchstack WordPress Vulnerability Report for advisory details.

No verified public proof-of-concept code is currently associated with this CVE. The vulnerability mechanism is described in prose without synthetic exploit code.

Detection Methods for CVE-2026-82226

Indicators of Compromise

HTTP requests to Tickera plugin endpoints containing serialized PHP markers such as O:, a:, or s: in parameters, cookies, or POST bodies.
Unexpected PHP worker errors referencing unserialize, __wakeup, or __destruct in web server or PHP-FPM logs.
New or modified PHP files under wp-content/uploads/ or plugin directories that were not deployed by administrators.
Outbound network connections initiated by the PHP process to unfamiliar hosts shortly after Tickera endpoint access.

Detection Strategies

Inspect web server access logs for requests to Tickera routes whose parameter values match serialized PHP object patterns.
Deploy a web application firewall rule that flags request bodies containing O:<digit>: followed by a class name string.
Correlate spikes in 500 responses from Tickera endpoints with subsequent process spawns from the PHP interpreter.

Monitoring Recommendations

Forward WordPress, PHP-FPM, and web server logs to a centralized log platform for behavioral analysis.
Monitor filesystem integrity on wp-content/plugins/tickera-event-ticketing-system/ and the WordPress uploads directory.
Alert on the www-data or PHP user spawning child processes such as sh, bash, curl, or wget.

How to Mitigate CVE-2026-82226

Immediate Actions Required

Update the Tickera Event Ticketing System plugin to a version later than 3.6.0.2 as soon as a fixed release is published by the vendor.
Audit WordPress sites for the presence of the vulnerable plugin and disable it if a patched version is not yet available.
Review web server and PHP logs for prior exploitation attempts against Tickera endpoints.
Rotate WordPress secrets, database credentials, and API keys on any host suspected of compromise.

Patch Information

Consult the Patchstack WordPress Vulnerability Report for the current patched version and vendor guidance. Apply the fix through the WordPress plugin update mechanism once available.

Workarounds

Deactivate and remove the Tickera plugin until a patched release is installed.
Deploy a web application firewall rule blocking requests containing serialized PHP object patterns targeting Tickera endpoints.
Restrict access to Tickera administrative and API endpoints by IP allowlist where feasible.
Enable PHP disable_functions for high-risk functions such as exec, system, and passthru to reduce post-exploitation impact.

bash

# Example WAF signature to block serialized PHP objects on Tickera routes
SecRule REQUEST_URI "@contains /wp-content/plugins/tickera" \
  "chain,phase:2,deny,status:403,id:1026822260,\
   msg:'Blocked PHP object injection attempt targeting Tickera (CVE-2026-82226)'"
  SecRule ARGS|REQUEST_BODY|REQUEST_COOKIES \
    "@rx O:[0-9]+:\"[A-Za-z_\\\\]+\":[0-9]+:\{" "t:none"