CVE-2026-12349 json
Premium Addons for KingComposer <= 1.1.1 - Missing Authorization to Unauthenticated Arbitrary Custom Sidebar Creation and Deletion via 'add_custom_sidebar' and 'remove_custom_sidebar' AJAX actions
published 4mo ago modified 4mo ago also EUVD-2026-40252
- cvss
- 5.3
- 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 36%
- public exploits
- 0
- none known
Summary
The Premium Addons for KingComposer plugin for WordPress is vulnerable to unauthorized modification and loss of data in versions up to, and including, 1.1.1. This is due to missing authorization and capability checks on the add_custom_sidebar() and remove_custom_sidebar() AJAX handlers, both of which are exposed through wp_ajax_nopriv_* hooks and write directly to the octagon_custom_sidebar option via update_option(). This makes it possible for unauthenticated attackers to create arbitrary custom widget areas or delete existing custom sidebars, which can cause widgets assigned to those areas to silently lose their registration and stop rendering.
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 4mo ago
Exploit prediction
0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected products
- octagonwebstudio Premium Addons for KingComposer
Classification
- Weakness
-
- CWE-862 Missing Authorization
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/5145b6bf-a726-4ef8-964f-63504bf7107e?source=cve
- plugins.trac.wordpress.org /browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L77
- plugins.trac.wordpress.org /browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L100
- plugins.trac.wordpress.org /browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L23
- plugins.trac.wordpress.org /browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L68
- plugins.trac.wordpress.org /browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L92
Sources
- CVE List CVE-2026-12349
- NVD CVE-2026-12349
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.