CVE-2026-75872CWE-80

CVE-2026-75872

published August 18, 2026

CVSS
6.9
EPSS
1%
Percentile
54.1
In the wild
Unconfirmed
What it is

HTML Injection in the public subscription form in maalfer MailerUp before 1.1.3 allows unauthenticated remote attackers to have the application send a message carrying arbitrary HTML, to an attacker-chosen address and from the form owner's configured sending identity, via the first_name field of the subscription request, which is interpolated unescaped into the double opt-in verification email.

The record
Technical detail
CVSS
6.9 · NONE
CVSS v4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00741 · 54.1th percentile
Weakness
CWE-80 · Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Published
2026-08-18T19:17Z
References (3)
https://github.com/maalfer/mailerup/commit/da4aedc9621911df4ce0cc8f0b321dd6d10f40a5 · 4daa8cea-433a-44bd-9456-53b127fc289ahttps://github.com/maalfer/mailerup/releases/tag/v1.1.3 · 4daa8cea-433a-44bd-9456-53b127fc289ahttps://secur0.com/en/cna/cve-list/cve-2026-75872-html-injection-in-mailerup-double-optin-verification-email · 4daa8cea-433a-44bd-9456-53b127fc289a
EPSS history
Timeline
  • 18 AUG 14:06Z
    HTML Injection in MailerUp double opt-in verification email
    cvelistv5