CVE-2026-66358 PUBLISHED

Assigner: jpcert
Reserved: 10.08.2026 Published: 19.08.2026 Updated: 19.08.2026

A cross-site scripting vulnerability exists in acmailer, which may allow an attacker to execute an arbitrary script.

CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS Score: 6.1

CVSS 3.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CVSS Score: 5.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	Low
Attack Complexity	Low	Integrity	None	Integrity	Low
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	Active

CVSS 4.0

Vendor	Extra Innovation Inc.
Product	acmailer CGI
Versions	Default: unaffected affected from 0 to 4.1.2 (excl.)

Vendor	Extra Innovation Inc.
Product	acmailer DB
Versions	Default: unaffected affected from 0 to 1.2.2 (excl.)