CVE-2026-42164

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 in the Text block/section functionality when a call is crafted in a certain way that allows it to recall the backed-up content from another Text section.

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
24%
KEV
Not listed

Published

August 17, 2026

Last Modified

August 18, 2026

Advisory Details (2)

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

Security announcements - Incorrect access control and improper validation of integrity in Mahara before 25.04.5 - Mahara ePortfolio System

https://mahara.org/interaction/forum/topic.php?id=10057
generic

Home - Mahara ePortfolio System

https://mahara.org

Vendor Advisories for CVE-2026-42164(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 09:45 UTCGHSA enrichment
  9. 2026-08-20 05:54 UTCGHSA enrichment
  10. 2026-08-20 02:03 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 09:10 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 12:26 UTCEG score recompute▲ 9.80
  25. 2026-08-18 12:26 UTCGHSA enrichment
Show 4 more
  1. 2026-08-18 12:24 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  2. 2026-08-17 23:21 UTCNVD update
  3. 2026-08-17 22:19 UTCEG score recompute
  4. 2026-08-17 22:18 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-42164?
CVE-2026-42164 is a critical vulnerability published on August 17, 2026. Mahara before 25.04.5 and 26.04.0 is vulnerable in the Text block/section functionality when a call is crafted in a certain way that allows it to recall the backed-up content from another Text section.
When was CVE-2026-42164 disclosed?
CVE-2026-42164 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-2026-42164 actively exploited?
CVE-2026-42164 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 76.5% of all scored CVEs.
What is the CVSS score of CVE-2026-42164?
CVE-2026-42164 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42164?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42164, 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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