ConvertKit <= 2.4.9 - Missing Authorization
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.
Summary
The ConvertKit – Email Newsletter, Email Marketing, Subscribers and Landing Pages plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the tag_subscriber function in all versions up to, and including, 2.4.9. This makes it possible for unauthenticated attackers to subscribe users to tags. Financial damages may occur to site owners if their API quota is exceeded.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| ConvertKit | Kit (formerly ConvertKit) – Email Newsletter, Email Marketing, Membership, Subscribers and Landing Pages | up to 2.4.9 | — | No fix listed | CNA |
- Kit (formerly ConvertKit) – Email Newsletter, Email Marketing, Membership, Subscribers and Landing Pages VendorConvertKit Affected up to 2.4.9 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:convertkit:convertkit_-_email_marketing\,_email_newsletter_and_landing_pages:*:*:*:*:*:wordpress:*:* | before 2.4.9.1 | Vulnerable | ConvertKit |
- cpe:2.3:a:convertkit:convertkit_-_email_marketing\,_email_newsletter_and_landing_pages:*:*:*:*:*:wordpress:*:* Versions before 2.4.9.1 Vulnerable ·ConvertKit
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2024-3961
- 2026-10-03 Alias added: GHSA-x26g-933q-fggm
References
More Convertkit - Email Marketing, Email Newsletter And Landing Pages vulnerabilities
- TI-2023-02193 ConvertKit < 2.2.1 - Reflected XSS CVSS 3.1MEDIUM 6.1
- TI-2022-04121 ConvertKit < 2.0.5 - Contributor+ Stored XSS CVSS 3.1MEDIUM 5.4
- TI-2024-20621 WordPress ConvertKit plugin <= 2.4.5 - Email Disclosure in Log File vulnerability CVSS 3.1HIGH 7.5
Sources
- CVE-2024-3961 · CVE Program
- CVE-2024-3961 · NVD
- FIRST EPSS
- GHSA-x26g-933q-fggm · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences