CVE-2026-82847

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreHIGH confidence

Score 6.8 from GitHub Security Advisory published 2026-09-12. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: 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 sanitise and escape one of its course fields before outputting it back in the course editor, allowing users with the instructor role to perform Stored Cross-Site Scripting attacks against higher privileged users such as administrators.

CVSS v3
6.8
EG Score
6.8(high)
EG Risk
31(Track)
EG Risk 31/100SSVC: 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
Severity68% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

September 12, 2026

Last Modified

September 14, 2026

Advisory Details (1)

Auto-updated Sep 12, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Masteriyo LMS < 3.4.1 – Instructor+ Stored XSS via Course Highlights | CVE 2026-82847 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/9cc4f7a7-e5b9-48fe-962b-f5d0753e6158/

Vendor Advisories for CVE-2026-82847(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 20× in last 7d / 41× 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. 2026-09-25 10:13 UTCEG score recompute
  2. 2026-09-25 10:13 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 08:56 UTCEG score recompute
  5. 2026-09-24 08:56 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 07:39 UTCEG score recompute
  8. 2026-09-23 07:39 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 06:22 UTCEG score recompute
  11. 2026-09-22 06:22 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 05:04 UTCEG score recompute
  14. 2026-09-21 05:04 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 03:46 UTCEG score recompute
  17. 2026-09-20 03:46 UTCGHSA enrichment
  18. 2026-09-19 02:29 UTCEG score recompute
  19. 2026-09-19 02:29 UTCGHSA enrichment
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 01:10 UTCEG score recompute
  22. 2026-09-18 01:10 UTCGHSA enrichment
  23. 2026-09-16 23:53 UTCEG score recompute
  24. 2026-09-16 23:53 UTCGHSA enrichment
  25. 2026-09-16 14:08 UTCEPSS rescore
Show 16 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-15 22:36 UTCEG score recompute
  3. 2026-09-15 22:36 UTCGHSA enrichment
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-14 21:19 UTCGHSA enrichment
  7. 2026-09-14 18:57 UTCGHSA enrichment
  8. 2026-09-13 17:40 UTCEG score recompute
  9. 2026-09-13 17:40 UTCGHSA enrichment
  10. 2026-09-12 16:23 UTCGHSA enrichment
  11. 2026-09-12 15:44 UTCEG score recompute▲ 6.80
  12. 2026-09-12 15:44 UTCGHSA enrichment
  13. 2026-09-12 15:43 UTCMITRE cvelistV5CVSS v3 → 6.8 · severity → MEDIUM
  14. 2026-09-12 06:20 UTCNVD update
  15. 2026-09-12 06:14 UTCEG score recompute
  16. 2026-09-12 06:13 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82847?
CVE-2026-82847 is a medium vulnerability published on September 12, 2026. The Masteriyo LMS WordPress plugin before 3.4.1 does not sanitise and escape one of its course fields before outputting it back in the course editor, allowing users with the instructor role to perform Stored Cross-Site Scripting attacks against higher privileged users such as administrators.
When was CVE-2026-82847 disclosed?
CVE-2026-82847 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-2026-82847 actively exploited?
CVE-2026-82847 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 65.4% of all scored CVEs.
What is the CVSS score of CVE-2026-82847?
CVE-2026-82847 has a CVSS v3.1 base score of 6.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-82847?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82847, 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

Explore the affected products and dependency analysis for CVE-2026-82847

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