CVE-2026-12583

HIGHPre-NVD 8.1Trending — 4 sources updated this weekElevated
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.1
EG Score
0.0(none)
EPSS
24.7%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 14, 2026

Advisory Details (1)

Auto-updated Jul 14, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Newsletters < 4.15 – Unauthenticated PHP Object Injection via Subscriber Custom Field | CVE 2026-12583 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/e4c44105-f43d-4dff-8487-7d8ae2691c4e/

Vendor Advisories for CVE-2026-12583(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 6× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-14 12:40 UTCMITRE cvelistV5CVSS v3 → 8.1 · severity → HIGH
  4. 2026-07-14 07:16 UTCNVD update
  5. 2026-07-14 06:05 UTCEG score recompute
  6. 2026-07-14 06:05 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12583?
CVE-2026-12583 is a high vulnerability published on July 14, 2026. 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…
When was CVE-2026-12583 disclosed?
CVE-2026-12583 was first published in the National Vulnerability Database on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12583 actively exploited?
CVE-2026-12583 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-12583?
CVE-2026-12583 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 0.0.
How do I remediate CVE-2026-12583?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12583, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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