CVE-2026-11976

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-07. a secondary CVSS source baseline 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 10.0Exploit: Elevated riskExposed: 0

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

The official MonsterInsights Pro update distribution bucket (monster-insights.s3.amazonaws.com) was compromised. Both the current release (10.2.2) and the version MonsterInsights rolled back to (10.2.0) contain a malicious file, class-system-check.php. Three distinct variants were observed on 2026-06-11, all sharing the same AES-256-GCM key, confirming a single threat actor. The attacker retains write access to the S3 bucket and has been actively iterating on the payload throughout the day.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
76(Attend)
EG Risk 76/100SSVC: Attend

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
Severity100% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 26, 2026

Advisory Details (1)

Auto-updated Sep 16, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

MonsterInsights Pro 10.2.0/10.2.2 – Backdoored via AWS S3 bucket compromise | CVE 2026-11976 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/d1250410-b919-4a90-8cf2-04031f9e5e2b/

Vendor Advisories for CVE-2026-11976(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 43× in last 7d / 189× 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 297 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-11976?
CVE-2026-11976 is a critical vulnerability published on August 6, 2026. The official MonsterInsights Pro update distribution bucket (monster-insights.s3.amazonaws.com) was compromised. Both the current release (10.2.2) and the version MonsterInsights rolled back to (10.2.0) contain a malicious file, class-system-check.php. Three distinct variants were observed on…
When was CVE-2026-11976 disclosed?
CVE-2026-11976 was first published in the National Vulnerability Database on August 6, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11976 actively exploited?
CVE-2026-11976 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 59.1% of all scored CVEs.
What is the CVSS score of CVE-2026-11976?
CVE-2026-11976 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-11976?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-11976, 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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