Newsletters < 4.16 - Unauthenticated Server-Side Request Forgery via SNS Bounce Handler
Priority HIGH 69CWE-918Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
The Newsletters WordPress plugin before 4.16 does not authenticate or validate a bounce-processing request before fetching a user-supplied URL on the server side, allowing unauthenticated attackers to make the site issue requests to arbitrary internal or external hosts.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00733 54th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Newsletters (Unknown): 4.16
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- 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 4.16 | 4.16 | Patch available | CNA |
- Newsletters VendorUnknown Affected before 4.16 Fixed in 4.16 Patch available CNA
Remediation
- Fix · CNA Newsletters (Unknown) Fixed in 4.16
Timeline
- 2026-10-02 Threatist record created from CVE-2026-16268
- 2026-10-03 Alias added: GHSA-mhrm-79mh-vhfj
References
Sources
- CVE-2026-16268 · CVE Program
- CVE-2026-16268 · NVD
- FIRST EPSS
- GHSA-mhrm-79mh-vhfj · 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