Multiple vulnerabilities in acmailer

unknownCVE-2026-66358 CVE-2026-70408

acmailer provided by Extra Innovation Inc. contains multiple vulnerabilities.

CSIRTS triage

vendor: Extra Innovation Inc.product: acmailerOther

What: Multiple unspecified vulnerabilities in acmailer.
Who is affected: Deployments using acmailer.
Urgency: Severity and exploitation status unknown; requires further advisory details.
Action: Contact vendor for patch information or workaround guidance.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: JVN (Japan Vulnerability Notes) (JP · national-cert · site)
Severity: unknown
Published: 2026-08-19
Exploitation: Not in CISA KEV at last sync

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

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-663580.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-704080.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-66358	coverage & exploitation status	NVD · CVE.org
CVE-2026-70408	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for acmailer

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-70408: An incorrect authorization vulnerability exists in acmailer, which may allow a user to create …nvd · 2026-08-19
mediumCVE-2026-66358: A cross-site scripting vulnerability exists in acmailer, which may allow an attacker to execut…nvd · 2026-08-19