CVE-2026-12583

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-07-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.1Exploit: Elevated riskExposed: 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
8.1(medium)
EG Risk
52(Track*)
EG Risk 52/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
44%
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 19× in last 7d / 110× 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.

Showing the most recent 100 of 152 total refreshes for this CVE.

  1. 2026-08-30 05:26 UTCEG score recompute
  2. 2026-08-30 05:26 UTCGHSA enrichment
  3. 2026-08-30 01:21 UTCEPSS rescore
  4. 2026-08-28 21:40 UTCEPSS rescore
  5. 2026-08-28 02:29 UTCEG score recompute
  6. 2026-08-28 02:29 UTCGHSA enrichment
  7. 2026-08-27 14:24 UTCEPSS rescore
  8. 2026-08-27 13:55 UTCGHSA enrichment
  9. 2026-08-27 00:04 UTCEG score recompute
  10. 2026-08-27 00:04 UTCGHSA enrichment
  11. 2026-08-26 07:34 UTCGHSA enrichment
  12. 2026-08-25 19:14 UTCEG score recompute
  13. 2026-08-25 19:14 UTCGHSA enrichment
  14. 2026-08-25 13:48 UTCEPSS rescore
  15. 2026-08-25 07:04 UTCGHSA enrichment
  16. 2026-08-24 19:55 UTCEG score recompute
  17. 2026-08-24 19:55 UTCGHSA enrichment
  18. 2026-08-24 05:45 UTCGHSA enrichment
  19. 2026-08-23 18:34 UTCGHSA enrichment
  20. 2026-08-23 07:26 UTCEG score recompute
  21. 2026-08-23 07:26 UTCGHSA enrichment
  22. 2026-08-23 00:19 UTCEPSS rescore
  23. 2026-08-22 20:17 UTCGHSA enrichment
  24. 2026-08-22 09:06 UTCEG score recompute
  25. 2026-08-22 09:06 UTCGHSA enrichment
Show 75 more
  1. 2026-08-21 23:48 UTCEPSS rescore
  2. 2026-08-21 21:57 UTCGHSA enrichment
  3. 2026-08-21 10:41 UTCGHSA enrichment
  4. 2026-08-20 23:26 UTCEG score recompute
  5. 2026-08-20 23:26 UTCGHSA enrichment
  6. 2026-08-20 22:55 UTCEPSS rescore
  7. 2026-08-20 12:17 UTCGHSA enrichment
  8. 2026-08-20 00:38 UTCEG score recompute
  9. 2026-08-20 00:38 UTCGHSA enrichment
  10. 2026-08-19 17:03 UTCEPSS rescore
  11. 2026-08-19 09:30 UTCGHSA enrichment
  12. 2026-08-18 22:19 UTCEG score recompute
  13. 2026-08-18 22:19 UTCGHSA enrichment
  14. 2026-08-18 13:48 UTCEPSS rescore
  15. 2026-08-18 10:28 UTCGHSA enrichment
  16. 2026-08-17 21:53 UTCEG score recompute
  17. 2026-08-17 21:53 UTCGHSA enrichment
  18. 2026-08-17 06:39 UTCGHSA enrichment
  19. 2026-08-16 19:31 UTCEG score recompute
  20. 2026-08-16 19:31 UTCGHSA enrichment
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 07:52 UTCEG score recompute
  23. 2026-08-16 07:52 UTCGHSA enrichment
  24. 2026-08-16 02:14 UTCEPSS rescore
  25. 2026-08-15 20:44 UTCGHSA enrichment
  26. 2026-08-15 09:35 UTCEG score recompute
  27. 2026-08-15 09:35 UTCGHSA enrichment
  28. 2026-08-15 01:30 UTCEPSS rescore
  29. 2026-08-14 22:26 UTCGHSA enrichment
  30. 2026-08-14 11:18 UTCGHSA enrichment
  31. 2026-08-14 00:09 UTCEG score recompute
  32. 2026-08-14 00:09 UTCGHSA enrichment
  33. 2026-08-13 22:00 UTCEPSS rescore
  34. 2026-08-13 13:00 UTCEG score recompute
  35. 2026-08-13 13:00 UTCGHSA enrichment
  36. 2026-08-13 01:52 UTCGHSA enrichment
  37. 2026-08-12 14:43 UTCEG score recompute
  38. 2026-08-12 14:43 UTCGHSA enrichment
  39. 2026-08-12 13:50 UTCEPSS rescore
  40. 2026-08-12 03:35 UTCGHSA enrichment
  41. 2026-08-11 16:26 UTCEG score recompute
  42. 2026-08-11 16:26 UTCGHSA enrichment
  43. 2026-08-11 13:42 UTCEPSS rescore
  44. 2026-08-11 05:18 UTCEG score recompute
  45. 2026-08-11 05:17 UTCGHSA enrichment
  46. 2026-08-10 23:59 UTCEPSS rescore
  47. 2026-08-10 18:09 UTCGHSA enrichment
  48. 2026-08-10 07:01 UTCGHSA enrichment
  49. 2026-08-09 19:52 UTCEG score recompute
  50. 2026-08-09 19:52 UTCGHSA enrichment
  51. 2026-08-09 13:46 UTCEPSS rescore
  52. 2026-08-09 08:44 UTCGHSA enrichment
  53. 2026-08-08 21:36 UTCEG score recompute
  54. 2026-08-08 21:36 UTCGHSA enrichment
  55. 2026-08-08 16:37 UTCEPSS rescore
  56. 2026-08-08 10:27 UTCGHSA enrichment
  57. 2026-08-07 23:19 UTCEG score recompute
  58. 2026-08-07 23:19 UTCGHSA enrichment
  59. 2026-08-07 12:10 UTCGHSA enrichment
  60. 2026-08-07 01:00 UTCGHSA enrichment
  61. 2026-08-06 13:52 UTCEG score recompute
  62. 2026-08-06 13:52 UTCGHSA enrichment
  63. 2026-08-06 13:46 UTCEPSS rescore
  64. 2026-08-06 02:43 UTCEG score recompute
  65. 2026-08-06 02:43 UTCGHSA enrichment
  66. 2026-08-05 19:17 UTCEPSS rescore
  67. 2026-08-05 15:34 UTCGHSA enrichment
  68. 2026-08-05 00:44 UTCEG score recompute
  69. 2026-08-05 00:44 UTCGHSA enrichment
  70. 2026-08-04 15:09 UTCEPSS rescore
  71. 2026-08-04 13:24 UTCEG score recompute
  72. 2026-08-04 13:24 UTCGHSA enrichment
  73. 2026-08-04 10:38 UTCEPSS rescore
  74. 2026-08-03 23:16 UTCGHSA enrichment
  75. 2026-08-03 12:07 UTCGHSA enrichment

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 1% probability of exploitation in the next 30 days, which ranks it in the top 56.3% of all scored CVEs.
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).
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.

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