Newsletter < 9.3.7 - Unauthenticated Open Redirect and Subscriber Token Disclosure via ncu Parameter
Priority LOW 30CWE-601Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-601.
Summary
The Newsletter WordPress plugin before 9.3.7 does not validate the destination of the redirect performed after a public subscription action, allowing unauthenticated attackers to redirect users to arbitrary external sites and to disclose a subscriber token that grants access to that subscriber record's front-end actions.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00323 25th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Newsletter (Unknown): 9.3.7
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 | Newsletter | before 9.3.7 | 9.3.7 | Patch available | CNA |
- Newsletter VendorUnknown Affected before 9.3.7 Fixed in 9.3.7 Patch available CNA
Remediation
- Fix · CNA Newsletter (Unknown) Fixed in 9.3.7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-86823
- 2026-10-03 Alias added: GHSA-xhvp-v8j9-2mrf
References
Sources
- CVE-2026-86823 · CVE Program
- CVE-2026-86823 · NVD
- FIRST EPSS
- GHSA-xhvp-v8j9-2mrf · 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