CVE-2023-4402: wordpress essential-blocks Deserialization of Untrusted Data
Vulnerability summary
CVE-2023-4402 is a critical (CVSS 9.8) Deserialization of Untrusted Data vulnerability in wordpress essential-blocks. EPSS estimates a 1.46% chance of exploitation in the next 30 days, higher than 73.2% of scored vulnerabilities. 1 public exploit is recorded. Fixed in 4.2.1 and 1.1.1.
Timeline
- 20-10-2023PublishedVulnerability first disclosed.
- 08-04-2026Last modifiedVulnerability information updated.
Description
The Essential Blocks plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 4.2.0 via deserialization of untrusted input in the get_products function. This allows unauthenticated attackers to inject a PHP Object. No POP chain is present in the vulnerable plugin. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.
CVSS metrics
3 scores · 3 sources · 1 version- CVE.orgCNA8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HDiffers
- wordfenceSource8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HDiffers
EPSS trend
Probability
1.46%
Chance of exploitation in the next 30 days
Percentile
73%
Versus all other CVEs
30-day change
+0.01 pp
From 1.45% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (plugins.trac.wordpress.org)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Wordpress2 products
- essential-blocks≤ 4.2.0 (fixed in 4.2.1)
- essential-blocks-pro≤ 1.1.0 (fixed in 1.1.1)
Wpdeveloper2 products
- essential_blocks< 4.2.1
- essential_blocks_pro< 1.1.1
Wpdevteam2 products
3 vendors · 6 products