CVE-2026-5347
WP Books Gallery <= 4.8.0 - Missing Authorization to Unauthenticated Settings Update via 'permalink_structure' Parameter
- 5.3MediumCVSS base score
- 0.32%Exploitation in 30 daysEPSS · top 74% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
The HM Books Gallery plugin for WordPress is vulnerable to Missing Authorization in versions up to and including 4.8.0. This is due to the absence of capability checks and nonce verification in the admin_init hook that handles the permalink settings update at line 205-209 of wp-books-gallery.php. The vulnerable code checks only for the presence of the 'permalink_structure' POST parameter before updating the 'wbg_cpt_slug' option, without verifying that the request comes from an authenticated administrator. This makes it possible for unauthenticated attackers to modify the custom post type slug for the books gallery, which changes the URL structure for all book entries and can break existing links and SEO rankings.
Timeline
ID reserved
By Wordfence
- 23 days later
· 23 days later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| WordfenceCNA (assigner) | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| NVDNVD · Deferred | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.32% · top 74% of all CVEs (10 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Affected products
References
6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/12bf1cd8-cd55-4771-b2bb-597797b1b949?source=cve (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wp-books-gallery/trunk/wp-books-gallery.php#L207 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wp-books-gallery/tags/4.7.8/wp-books-gallery.php#L207 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wp-books-gallery/trunk/wp-books-gallery.php#L206 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wp-books-gallery/tags/4.7.8/wp-books-gallery.php#L206 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wp-books-gallery/tags/4.8.1/wp-books-gallery.php#L207 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-25398 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-5347)Record last updated .