CVE-2026-70408

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-19. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

An incorrect authorization vulnerability exists in acmailer, which may allow a user to create a sub-account that has administrative privileges.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 19, 2026

Advisory Details (2)

Auto-updated Aug 19, 2026
No patch confirmed yet.
generic

acmailer│無料で使えるメール配信CGI「エーシーメーラー」│インフォメーション

https://www.acmailer.jp/info/de.cgi?id=119
generic

JVN#47716829: Multiple vulnerabilities in acmailer

https://jvn.jp/en/jp/JVN47716829/

Vendor Advisories for CVE-2026-70408(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 14× in last 7d / 14× 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 01:23 UTCEG score recompute
  2. 2026-08-21 01:23 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 14:24 UTCGHSA enrichment
  5. 2026-08-20 03:25 UTCEG score recompute
  6. 2026-08-20 03:24 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 16:25 UTCEG score recompute
  9. 2026-08-19 16:25 UTCGHSA enrichment
  10. 2026-08-19 15:49 UTCEG score recompute
  11. 2026-08-19 15:49 UTCGHSA enrichment
  12. 2026-08-19 05:19 UTCEG score recompute
  13. 2026-08-19 05:07 UTCEG score recompute
  14. 2026-08-19 05:07 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-70408?
CVE-2026-70408 is a high vulnerability published on August 19, 2026. An incorrect authorization vulnerability exists in acmailer, which may allow a user to create a sub-account that has administrative privileges.
When was CVE-2026-70408 disclosed?
CVE-2026-70408 was first published in the National Vulnerability Database on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-70408 actively exploited?
CVE-2026-70408 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 73.6% of all scored CVEs.
What is the CVSS score of CVE-2026-70408?
CVE-2026-70408 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-70408?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70408, 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-2026-70408

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