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CVE-2026-125439 WordPress Kit (formerly ConvertKit) plugin <= 3.5.0 - Broken Access Control vulnerability

5.3 mediumEPSS 0.3%Fix available

Medium (5.3) in kit kit (formerly convertkit). EPSS 0.3% estimated probability of exploitation activity in the next 30 days.

On this page
Missing Authorization vulnerability in Kit Kit (formerly ConvertKit) convertkit allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Kit (formerly ConvertKit): from n/a through 3.5.0.

Severity

CVSS 3.1

5.3 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS
0.3% estimated probability of exploitation activity in the next 30 days; 23rd percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CISA's assessment (SSVC)
Exploitation: none · Automatable: yes · Technical impact: partial, assessed 2026-11-11. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
CWE
CWE-862 Missing Authorization
OWASP Top 10
A01:2025 Broken Access Control
Published
Modified
Assigned by
Patchstack (CNA)
NVD analysis
Deferred: the NVD does not plan to analyze it
Record from
the NVD, synced

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Affected

  • kit:kit (formerly convertkit)

Versions

From the CNA's record in the CVE List.

ProductAffected
Kit (formerly ConvertKit)through 3.5.0

Fixed in

ProductFixed in
Kit (formerly ConvertKit)3.5.1

Fix and patched versions

  • Kit Kit (formerly ConvertKit): fixed in 3.5.1

GitHub PoC (unverified)

Repositories on GitHub named after this CVE. Nobody has checked them and they are not scanned: some hold a working proof of concept, some nothing useful, and some malware made to look like one. Read the code before you run any of it.

  • kanokwut/CVE-2026-125439-poc 0 stars, Shell, created
    PoC for CVE-2026-125439: Kit (formerly ConvertKit) Member Content paywall bypass via the REST API excerpt field. Fixed in 3.5.1.

Attack patterns (CAPEC)

  • CAPEC-665 Exploitation of Thunderbolt Protection Flaws Likelihood: Low · Severity: Very High

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

History

  1. The NVD deferred its analysis

Changes since this site first stored the record. The same for every record: /api/public/changes.

References

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