Newsletters < 4.18.1 - Unauthenticated Subscriber Record Overwrite and PII Disclosure via IDOR
Priority LOW 34CWE-639Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-639.
Summary
The Newsletters WordPress plugin before 4.18.1 does not perform an ownership check on some of its subscriber management actions, and issues a management session to unauthenticated visitors on request, allowing attackers to read any subscriber's personal data and overwrite any subscriber's record including their email address.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00266 18th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Newsletters (Unknown): 4.18.1
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 |
|---|---|---|---|---|---|
| Unknown | Newsletters | before 4.18.1 | 4.18.1 | Patch available | CNA |
- Newsletters VendorUnknown Affected before 4.18.1 Fixed in 4.18.1 Patch available CNA
Remediation
- Fix · CNA Newsletters (Unknown) Fixed in 4.18.1
Timeline
- 2026-10-02 Threatist record created from CVE-2026-16264
- 2026-10-03 Alias added: GHSA-q3j5-fxpp-r5pf
References
Sources
- CVE-2026-16264 · CVE Program
- CVE-2026-16264 · NVD
- FIRST EPSS
- GHSA-q3j5-fxpp-r5pf · 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