CVE-2026-82845

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreHIGH confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-12. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.9Exploit: None knownExposed: 0

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

The Masteriyo LMS WordPress plugin before 3.4.1 does not prevent user-supplied values held as metadata from being deserialized when they are read back, allowing users with a minimal account to inject arbitrary PHP objects and, by way of a class shipped in a library bundled with the Masteriyo LMS WordPress plugin before 3.4.1, write and execute arbitrary code on the server. A weaker form of the same issue is reachable without an account and yields an arbitrary file write rather than code execution.

CVSS v3
9.9
EG Score
9.9(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity99% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

September 12, 2026

Last Modified

September 14, 2026

Advisory Details (1)

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

Masteriyo LMS < 3.4.1 – Subscriber+ PHP Object Injection | CVE 2026-82845 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/5ced30ea-8b78-495f-b10c-42b3f10adcb3/

Vendor Advisories for CVE-2026-82845(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 57× in last 7d / 70× 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. 2026-09-20 12:07 UTCGHSA enrichment
  2. 2026-09-20 08:17 UTCGHSA enrichment
  3. 2026-09-20 04:31 UTCGHSA enrichment
  4. 2026-09-20 00:46 UTCGHSA enrichment
  5. 2026-09-19 21:01 UTCGHSA enrichment
  6. 2026-09-19 17:16 UTCEG score recompute
  7. 2026-09-19 17:16 UTCGHSA enrichment
  8. 2026-09-19 13:31 UTCGHSA enrichment
  9. 2026-09-19 09:46 UTCGHSA enrichment
  10. 2026-09-19 06:01 UTCGHSA enrichment
  11. 2026-09-19 02:14 UTCGHSA enrichment
  12. 2026-09-18 22:23 UTCEG score recompute
  13. 2026-09-18 22:22 UTCGHSA enrichment
  14. 2026-09-18 19:28 UTCEPSS rescore
  15. 2026-09-18 18:37 UTCGHSA enrichment
  16. 2026-09-18 14:52 UTCGHSA enrichment
  17. 2026-09-18 11:07 UTCGHSA enrichment
  18. 2026-09-18 07:22 UTCGHSA enrichment
  19. 2026-09-18 03:37 UTCGHSA enrichment
  20. 2026-09-17 23:52 UTCGHSA enrichment
  21. 2026-09-17 19:36 UTCEG score recompute
  22. 2026-09-17 19:36 UTCGHSA enrichment
  23. 2026-09-17 13:30 UTCGHSA enrichment
  24. 2026-09-17 09:41 UTCGHSA enrichment
  25. 2026-09-17 05:56 UTCGHSA enrichment
Show 45 more
  1. 2026-09-17 02:07 UTCGHSA enrichment
  2. 2026-09-16 22:21 UTCGHSA enrichment
  3. 2026-09-16 18:27 UTCGHSA enrichment
  4. 2026-09-16 14:39 UTCEG score recompute
  5. 2026-09-16 14:39 UTCGHSA enrichment
  6. 2026-09-16 14:08 UTCEPSS rescore
  7. 2026-09-16 10:54 UTCGHSA enrichment
  8. 2026-09-16 07:09 UTCEG score recompute
  9. 2026-09-16 07:09 UTCGHSA enrichment
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-16 03:24 UTCGHSA enrichment
  12. 2026-09-15 23:39 UTCGHSA enrichment
  13. 2026-09-15 19:54 UTCGHSA enrichment
  14. 2026-09-15 16:09 UTCGHSA enrichment
  15. 2026-09-15 12:24 UTCGHSA enrichment
  16. 2026-09-15 08:39 UTCGHSA enrichment
  17. 2026-09-15 04:54 UTCEG score recompute
  18. 2026-09-15 04:53 UTCGHSA enrichment
  19. 2026-09-15 03:12 UTCEPSS rescore
  20. 2026-09-15 03:12 UTCEPSS rescore
  21. 2026-09-15 01:04 UTCGHSA enrichment
  22. 2026-09-14 21:19 UTCGHSA enrichment
  23. 2026-09-14 20:54 UTCGHSA enrichment
  24. 2026-09-14 17:09 UTCGHSA enrichment
  25. 2026-09-14 13:24 UTCGHSA enrichment
  26. 2026-09-14 09:39 UTCGHSA enrichment
  27. 2026-09-14 05:54 UTCGHSA enrichment
  28. 2026-09-14 02:09 UTCGHSA enrichment
  29. 2026-09-13 22:24 UTCGHSA enrichment
  30. 2026-09-13 18:39 UTCEG score recompute
  31. 2026-09-13 18:39 UTCGHSA enrichment
  32. 2026-09-13 14:54 UTCGHSA enrichment
  33. 2026-09-13 11:09 UTCGHSA enrichment
  34. 2026-09-13 07:23 UTCGHSA enrichment
  35. 2026-09-13 03:39 UTCGHSA enrichment
  36. 2026-09-12 23:54 UTCGHSA enrichment
  37. 2026-09-12 20:09 UTCEG score recompute
  38. 2026-09-12 20:09 UTCGHSA enrichment
  39. 2026-09-12 16:23 UTCGHSA enrichment
  40. 2026-09-12 15:44 UTCEG score recompute▲ 9.90
  41. 2026-09-12 15:44 UTCGHSA enrichment
  42. 2026-09-12 15:43 UTCMITRE cvelistV5CVSS v3 → 9.9 · severity → CRITICAL
  43. 2026-09-12 06:20 UTCNVD update
  44. 2026-09-12 06:14 UTCEG score recompute
  45. 2026-09-12 06:13 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82845?
CVE-2026-82845 is a critical vulnerability published on September 12, 2026. The Masteriyo LMS WordPress plugin before 3.4.1 does not prevent user-supplied values held as metadata from being deserialized when they are read back, allowing users with a minimal account to inject arbitrary PHP objects and, by way of a class shipped in a library bundled with the Masteriyo LMS…
When was CVE-2026-82845 disclosed?
CVE-2026-82845 was first published in the National Vulnerability Database on September 12, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82845 actively exploited?
CVE-2026-82845 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 70.8% of all scored CVEs.
What is the CVSS score of CVE-2026-82845?
CVE-2026-82845 has a CVSS v3.1 base score of 9.9 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-82845?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82845, 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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