CVE-2026-12349
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
- 5.3MediumCVSS base score
- 0.42%Exploitation in 30 daysEPSS · top 64% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Wordfence
- 15 days later
· 15 days later
Published
- 1 day later
· 1 day later
Record updated
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)
- 0.42% · top 64% of all CVEs (9 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
octagonwebstudio · Premium Addons for KingComposer
- affected ≤ 1.1.1
References
6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/5145b6bf-a726-4ef8-964f-63504bf7107e?source=cve (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L77 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L100 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L23 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L68 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L92 (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-2026-40252 (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-2026-12349)Record last updated .