Newsletter < 9.3.8 - Unauthenticated Subscriber PII Disclosure and Modification via Predictable Tracking Signature Key
Priority LOW 21CWE-326Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- 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-326.
Summary
The Newsletter WordPress plugin before 9.3.8 does not generate its email tracking signing key with sufficient entropy and signs its tracking links with an unkeyed hash, allowing an unauthenticated attacker who recovers that key offline to forge tracking links, obtain any subscriber's session token, and read and modify that subscriber's stored personal data.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00152 4th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Newsletter (Unknown): 9.3.8
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- 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 | Newsletter | before 9.3.8 | 9.3.8 | Patch available | CNA |
- Newsletter VendorUnknown Affected before 9.3.8 Fixed in 9.3.8 Patch available CNA
Remediation
- Fix · CNA Newsletter (Unknown) Fixed in 9.3.8
Timeline
- 2026-10-02 Threatist record created from CVE-2026-86824
- 2026-10-03 Alias added: GHSA-w6v2-ggcj-c4hg
References
Sources
- CVE-2026-86824 · CVE Program
- CVE-2026-86824 · NVD
- FIRST EPSS
- GHSA-w6v2-ggcj-c4hg · 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