Newsletters < 4.15 - Unauthenticated PHP Object Injection via Subscriber Custom Field
Priority HIGH 70CWE-502Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-502.
Summary
The Newsletters WordPress plugin before 4.15 does not prevent deserialization of untrusted input that is stored through a public form, allowing unauthenticated attackers to inject a PHP object and, via a property-oriented gadget chain bundled with the Newsletters WordPress plugin before 4.15, write arbitrary files and execute code on the server.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.02027 81st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Newsletters (Unknown): 4.15
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
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 4.15 | 4.15 | Patch available | CNA |
- Newsletters VendorUnknown Affected before 4.15 Fixed in 4.15 Patch available CNA
Remediation
- Fix · CNA Newsletters (Unknown) Fixed in 4.15
Timeline
- 2026-10-02 Threatist record created from CVE-2026-12583
- 2026-10-03 Alias added: GHSA-cxqr-jhpf-63mm
- 2026-11-06 EPSS moved to the 50th–90th percentile
References
Sources
- CVE-2026-12583 · CVE Program
- CVE-2026-12583 · NVD
- FIRST EPSS
- GHSA-cxqr-jhpf-63mm · 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