CVE-2026-11977 json
WP Post Author <= 3.9.1 - Authenticated (Author+) SQL Injection
published 3mo ago modified 2mo ago also EUVD-2026-53288
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 35%
- public exploits
- 0
- none known
Summary
The WP Post Author – Author Box, Multiple Authors, Guest Authors & Custom Avatars plugin for WordPress is vulnerable to generic SQL Injection via the 'wpma_metabox_authors_list' parameter in all versions up to, and including, 3.9.1 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for authenticated attackers, with author-level access and above, to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database. Exploitation is a two-step chain: an attacker first saves a crafted guest-author token via the wpma_metabox_authors_list parameter during post creation or editing, then triggers the injection when any admin user loads the post list screen at /wp-admin/edit.php, causing the injected SQL result to be rendered in the Authors column.
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3mo ago
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected products
- afthemes WP Post Author – Author Box, Multiple Authors, Guest Authors & Custom Avatars
Classification
- Weakness
-
- CWE-89 Improper Neutralization of Special Elements used in an SQL Command
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/ca5cb925-6f95-4f81-92d0-5f3c8e5f7d59?source=cve
- plugins.trac.wordpress.org /browser/wp-post-author/trunk/includes/multi-authors/wpa-multi-authors.php#L312
- plugins.trac.wordpress.org /browser/wp-post-author/trunk/includes/multi-authors/wpa-multi-authors.php#L110
- plugins.trac.wordpress.org /browser/wp-post-author/trunk/includes/multi-authors/wpa-multi-authors.php#L231
- plugins.trac.wordpress.org /changeset?sfp_email=&sfph_mail=&reponame=&new=3577603%40wp-post-author%2Ftrunk%2Fincludes%2Fmulti-authors%2Fw
Sources
- CVE List CVE-2026-11977
- NVD CVE-2026-11977
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