Five Critical WordPress Plugin and Theme Flaws Enable Site Takeover or RCE
Five critical vulnerabilities disclosed across popular WordPress plugins and themes, all rated 9.8–10.0 CVSS, enabling authentication bypass, account takeover, and remote code execution CVE-2026-82222 (CVSS 10.0) in GiveWP chains a broken "safe unserialize" helper with a donation flow and shipped gadget chain to achieve RCE CVE-2026-76581 in WPMU DEV Dashboard allows unauthenticated admin access via SSO authentication bypass CVE-2026-18431 in Avada theme permits unauthenticated arbitrary file wr
Analysis
TL;DR
- Five critical vulnerabilities disclosed across popular WordPress plugins and themes, all rated 9.8–10.0 CVSS, enabling authentication bypass, account takeover, and remote code execution
- CVE-2026-82222 (CVSS 10.0) in GiveWP chains a broken "safe unserialize" helper with a donation flow and shipped gadget chain to achieve RCE
- CVE-2026-76581 in WPMU DEV Dashboard allows unauthenticated admin access via SSO authentication bypass
- CVE-2026-18431 in Avada theme permits unauthenticated arbitrary file write leading to PHP remote code execution
- Root causes trace back to flawed serialization sanitization, blind trust in database-stored data, and development-only libraries shipped in production
Why It Matters
This disclosure highlights a systemic pattern in WordPress security: seemingly minor implementation flaws in serialization and authentication flows can cascade into complete site compromise. For AI practitioners and security researchers, it underscores the importance of supply chain integrity and the real-world impact of PHP object injection vulnerabilities in widely deployed ecosystems.
Technical Details
- CVE-2026-76581 (CVSS 9.8): Authentication bypass in WPMU DEV Dashboard (≤5.0.1). Unauthenticated attackers on sites with Hub SSO enabled and admin mapping can obtain administrator access and achieve full site takeover.
- CVE-2026-18431 (CVSS 9.8): Arbitrary file write in Avada theme (≤7.16) with Fusion Builder plugin (≤3.16). Unauthenticated attackers can write attacker-controlled files to the server, create and execute arbitrary PHP files, and achieve remote code execution.
- CVE-2026-19632 (CVSS 9.8): Sensitive information exposure in TranslatePress (≤3.3.1). When automatic string saving is enabled and the admin's profile locale is set to a published secondary language, attackers can extract the raw password-reset URL with plaintext reset key and login parameters.
- CVE-2026-19598 (CVSS 9.8): Privilege escalation in Pods plugin (≤3.3.9). Unauthenticated attackers can escalate to Administrator or overwrite any user's password, including the site owner's.
- CVE-2026-82222 (CVSS 10.0): Remote code execution in GiveWP (≤4.16.7.1). The vulnerability chains a broken "safe unserialize" helper that fails to strip PHP objects, a donation flow feeding attacker-controlled data into that helper, and a gadget chain in libraries shipped by GiveWP. Three conditions must align: a storage location for serialized objects, code that unserializes them, and available gadget chains in loaded classes.
Industry Insight
- WordPress ecosystem security remains critically dependent on plugin/theme developer practices; organizations should audit their installed plugins against this list immediately and apply patches, as all five vulnerabilities are remotely exploitable without authentication.
- The GiveWP RCE flaw illustrates a growing class of vulnerabilities where development-only dependencies leak into production, providing pre-built gadget chains for PHP object injection attacks—developers must enforce strict dependency auditing and production build pipelines.
- The common root cause across multiple flaws (trusting serialization sanitizers, unvalidated database reads) suggests a need for broader security review of WordPress plugin codebases, particularly around data handling patterns that assume stored data is inherently safe.
Disclaimer: The above content is generated by AI and is for reference only.