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Public proof of concept

CVE-2026-12583

A public proof of concept exists; no exploitation attested.

  • Published2026-07-14
  • WeaknessCWE-502

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-11-0514:14Nuclei detection templateProjectDiscovery

Versions per branch

Products declared by the CNA

As WPScan, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • Unknown Newslettersother versions: not affected
    Affected
    • < 4.15fixed in 4.15semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-07-14

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-12583 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-11-06 06:14 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-07-14
Last Modified
2026-07-14
NVD status
Deferred
GitHub Advisory
GHSA-cxqr-jhpf-63mm

Frequently asked questions

What is CVE-2026-12583?

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.

Is CVE-2026-12583 actively exploited?

A proof-of-concept exploit exists for CVE-2026-12583, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-12583?

CVE-2026-12583 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Same product first, then the same vendor advisory and the same publication week.

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Sources for this record