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TI-2026-53112 Aliases CVE-2026-75872GHSA-gj4p-rxxg-6jhm

HTML Injection in MailerUp double opt-in verification email

Priority LOW 32CWE-80Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-80.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00741 54th percentileScored 2026-11-07
Fix Fixed MailerUp (maalfer): 1.1.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
maalferMailerUpbefore 1.1.31.1.3Patch availableCNA
  • MailerUp Vendormaalfer Affected before 1.1.3 Fixed in 1.1.3 Patch available CNA

Remediation

  • Fix · CNA MailerUp (maalfer) Fixed in 1.1.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-75872
  2. 2026-10-03 Alias added: GHSA-gj4p-rxxg-6jhm

References

Patch 1

Other 2

  • TI-2026-42379 Stored XSS in Pentestify via unsanitized finding images and report client logo CVSS 4.0MEDIUM 6.9
  • TI-2026-16010 Stored Cross-site Scripting in Pentestify Markdown renderer via unescaped quotes CVSS 4.0MEDIUM 5.1
  • TI-2026-15995 Stored Cross-site Scripting in Pentestify user account deletion via unescaped username CVSS 4.0MEDIUM 5.1
  • TI-2026-15841 Stored Cross-site Scripting in Pentestify finding severity field CVSS 4.0MEDIUM 5.1
  • TI-2026-53309 CSS sanitizer bypass in Pentestify report themes allows forced outbound requests CVSS 4.0MEDIUM 5.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences