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TI-2026-13602 Aliases CVE-2026-16267GHSA-jxc3-pfg8-hv86

Newsletters < 4.16 - Unauthenticated PHP Object Injection via Date Form Field

Priority LOW 38CWE-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 4.16 does not restrict the classes allowed when unserialising a value taken from a public form submission, allowing unauthenticated attackers to inject arbitrary PHP objects.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00453 39th 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
None
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

VendorProductAffected versionsFixed inStatusSource
UnknownNewslettersbefore 4.164.16Patch availableCNA
  • Newsletters VendorUnknown Affected before 4.16 Fixed in 4.16 Patch available CNA

Remediation

  • Fix · CNA Newsletters (Unknown) Fixed in 4.16

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Newsletters 4.16

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-13604 Newsletters < 4.16 - Unauthenticated API Authentication Bypass via Type JugglingPriority LOW 22
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-16267
  2. 2026-10-03 Alias added: GHSA-jxc3-pfg8-hv86

References

Exploit 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences