CVE-2026-42163

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-18. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

Mahara before 25.04.5 and 26.04.0 is vulnerable to unauthorized access to internal accounts via Learning Tools Interoperability (LTI) under certain circumstances. This applies to LTI 1.1 and LTI 1.3 Advantage.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

August 17, 2026

Last Modified

August 18, 2026

Advisory Details (1)

Auto-updated Aug 18, 2026
No patch confirmed yet.
generic

Security announcements - Security maintenance releases Mahara 25.04.7 and Mahara 26.04.1 - Mahara ePortfolio System

https://mahara.org/interaction/forum/topic.php?id=10077

Vendor Advisories for CVE-2026-42163(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 29× in last 7d / 29× 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. 2026-08-21 05:27 UTCGHSA enrichment
  2. 2026-08-21 01:36 UTCEG score recompute
  3. 2026-08-21 01:36 UTCGHSA enrichment
  4. 2026-08-20 22:55 UTCEPSS rescore
  5. 2026-08-20 21:45 UTCGHSA enrichment
  6. 2026-08-20 17:54 UTCGHSA enrichment
  7. 2026-08-20 14:02 UTCGHSA enrichment
  8. 2026-08-20 09:46 UTCGHSA enrichment
  9. 2026-08-20 05:55 UTCGHSA enrichment
  10. 2026-08-20 02:04 UTCGHSA enrichment
  11. 2026-08-19 22:12 UTCGHSA enrichment
  12. 2026-08-19 18:20 UTCEG score recompute
  13. 2026-08-19 18:20 UTCGHSA enrichment
  14. 2026-08-19 17:03 UTCEPSS rescore
  15. 2026-08-19 13:04 UTCGHSA enrichment
  16. 2026-08-19 09:11 UTCGHSA enrichment
  17. 2026-08-19 05:19 UTCGHSA enrichment
  18. 2026-08-19 01:28 UTCGHSA enrichment
  19. 2026-08-18 21:37 UTCGHSA enrichment
  20. 2026-08-18 17:19 UTCEG score recompute
  21. 2026-08-18 17:18 UTCGHSA enrichment
  22. 2026-08-18 13:48 UTCEPSS rescore
  23. 2026-08-18 13:23 UTCGHSA enrichment
  24. 2026-08-18 12:42 UTCEG score recompute▲ 9.80
  25. 2026-08-18 12:42 UTCGHSA enrichment
Show 4 more
  1. 2026-08-18 12:41 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  2. 2026-08-17 22:20 UTCNVD update
  3. 2026-08-17 22:09 UTCEG score recompute
  4. 2026-08-17 22:08 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-42163?
CVE-2026-42163 is a critical vulnerability published on August 17, 2026. Mahara before 25.04.5 and 26.04.0 is vulnerable to unauthorized access to internal accounts via Learning Tools Interoperability (LTI) under certain circumstances. This applies to LTI 1.1 and LTI 1.3 Advantage.
When was CVE-2026-42163 disclosed?
CVE-2026-42163 was first published in the National Vulnerability Database on August 17, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42163 actively exploited?
CVE-2026-42163 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 73.9% of all scored CVEs.
What is the CVSS score of CVE-2026-42163?
CVE-2026-42163 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42163?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42163, 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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