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CVE-2026-75872

HTML Injection in MailerUp double opt-in verification email

MEDIUM
6.9
CVSS Score
Published: August 18, 2026 at 02:06 PM UTC
Updated: October 22, 2026 at 10:10 PM UTC
1 product affected across 1 vendorMailerUp

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Severity
MEDIUM6.9
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

MailerUp· Maalfer
90%
0 ≤ v < 1.1.30
Affected range stops below 1.1.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Patch
Source: cverecord
https://github.com/maalfer/mailerup/commit/da4aedc9621911df4ce0cc8f0b321dd6d10f40a5
Release Notes
Source: cverecord
https://github.com/maalfer/mailerup/releases/tag/v1.1.3
Technical Description
Source: cverecord
https://secur0.com/en/cna/cve-list/cve-2026-75872-html-injection-in-mailerup-double-optin-verification-email

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.9MEDIUMSecur0
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-80

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