CVE-2025-4803
Published: 21 May 2025
Summary
CVE-2025-4803 is a high-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Wordpress (inferred from references). Its CVSS base score is 7.2 (High).
Operationally, ranked in the top 19.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
The Glossary by WPPedia – Best Glossary plugin for WordPress is affected by a PHP Object Injection vulnerability (CWE-502) in all versions through 1.3.0. The flaw stems from unsafe deserialization of untrusted input supplied via the 'posttypes' parameter in the plugin's options and data-sanitization handling.
Authenticated attackers with Administrator privileges can supply a crafted payload to inject a PHP object. No POP chain exists in the plugin itself, so the vulnerability produces no direct impact unless another plugin or theme on the site supplies a usable chain; when one is present, the attacker may be able to delete arbitrary files, access sensitive data, or execute code.
The listed references point to the vulnerable code paths in trait-sanitizes-data.php and class-options.php but contain no explicit mitigation guidance or patch details beyond the version bound stated in the CVE.
EPSS remains flat at 0.0138 with no material rise after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-16073
Vulnerability details
The Glossary by WPPedia – Best Glossary plugin for WordPress plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 1.3.0 via deserialization of untrusted input from the 'posttypes' parameter. This makes it possible…
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for authenticated attackers, with Administrator-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing supplies malicious serialized objects, detecting unsafe deserialization and supporting corrective actions.
Evaluation of untrusted data handling (deserialization testing) reveals unsafe processing, which the required remediation process addresses.
Untrusted serialized data can be deserialized and observed inside the chamber, blocking gadget-chain exploitation outside the sandbox.
Validates or rejects untrusted serialized data before deserialization occurs.
Identifies and blocks malicious code introduced through deserialization of untrusted data at system boundaries.
Integrity verification of serialized information can detect tampering before deserialization occurs.
Provenance of associated data allows detection of untrusted sources before deserialization or processing occurs.