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.
CVE-2026-12349
MEDIUMPre-NVD 5.35.3—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 5.3 from GitHub Security Advisory published 2026-06-30. a secondary CVSS source baseline 5.3; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.3
- EG Score
- 5.3(high)
- EPSS
- 15.0%
- KEV
- Not listed
Published
June 30, 2026
Last Modified
July 1, 2026
References (6)
- security@wordfencehttps://plugins.trac.wordpress.org/browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L100
- security@wordfencehttps://plugins.trac.wordpress.org/browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L23
- security@wordfencehttps://plugins.trac.wordpress.org/browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L68
- security@wordfencehttps://plugins.trac.wordpress.org/browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L77
- security@wordfencehttps://plugins.trac.wordpress.org/browser/premium-addons-for-kingcomposer/trunk/core/class-sidebar.php#L92
- security@wordfencehttps://www.wordfence.com/threat-intel/vulnerabilities/id/5145b6bf-a726-4ef8-964f-63504bf7107e?source=cve
Vendor Advisories for CVE-2026-12349(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 22× in last 7d / 22× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-06 16:27 UTCEPSS rescore
- 2026-07-06 08:24 UTCEG score recompute
- 2026-07-06 08:24 UTCGHSA enrichment
- 2026-07-06 02:23 UTCEPSS rescore
- 2026-07-05 08:03 UTCEG score recompute
- 2026-07-05 08:03 UTCGHSA enrichment
- 2026-07-05 02:30 UTCEPSS rescore
- 2026-07-05 02:30 UTCEPSS rescore
- 2026-07-04 07:46 UTCEG score recompute
- 2026-07-04 07:45 UTCGHSA enrichment
- 2026-07-04 06:31 UTCEPSS rescore
- 2026-07-03 07:22 UTCEG score recompute
- 2026-07-03 07:22 UTCGHSA enrichment
- 2026-07-02 07:06 UTCEG score recompute
- 2026-07-02 07:06 UTCGHSA enrichment
- 2026-07-01 15:06 UTCEPSS rescore
- 2026-07-01 15:06 UTCEPSS rescore
- 2026-07-01 06:49 UTCEG score recompute
- 2026-07-01 06:48 UTCGHSA enrichment
- 2026-06-30 23:22 UTCEPSS rescore
- 2026-06-30 06:31 UTCEG score recompute
- 2026-06-30 06:31 UTCNVD updatefirst tracked
Frequently asked(5)
What is CVE-2026-12349?
CVE-2026-12349 is a medium vulnerability published on June 30, 2026. 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 addcustomsidebar() and removecustomsidebar() AJAX handlers, both of which…
When was CVE-2026-12349 disclosed?
CVE-2026-12349 was first published in the National Vulnerability Database on June 30, 2026, with the most recent update on July 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12349 actively exploited?
CVE-2026-12349 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 15.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-12349?
CVE-2026-12349 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-12349?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12349, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-12349
Is Your Infrastructure Affected by CVE-2026-12349?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.