CVE-2026-4030: wordpress wp-db-backup Missing Authorization
Vulnerability summary
CVE-2026-4030 is a high (CVSS 8.1) Missing Authorization vulnerability in wordpress wp-db-backup. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.4% of scored vulnerabilities. Fixed in 2.5.3.
Timeline
- 14-05-2026PublishedVulnerability first disclosed.
- 14-05-2026Last modifiedVulnerability information updated.
Description
The Database Backup for WordPress plugin for WordPress is vulnerable to unauthorized arbitrary file read and deletion in all versions up to, and including, 2.5.2. This is due to the plugin not properly enforcing the return value of its authorization check combined with a user-controlled backup directory parameter. This makes it possible for unauthenticated attackers to read and delete arbitrary files on the server, leading to Sensitive Information Exposure and potential site takeover. Note: This vulnerability is only exploitable in WordPress Multisite environments where the deprecated is_site_admin() function exists.
CVSS metrics
3 scores · 3 sources · 1 version- NVDNIST8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- wordfenceSource8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.57%
Chance of exploitation in the next 30 days
Percentile
46%
Versus all other CVEs
30-day change
+0.11 pp
From 0.46% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Wordpress1 product
- wp-db-backup≤ 2.5.2 (fixed in 2.5.3)
Wpengine1 product
2 vendors · 2 products