CVE-2026-26747 Open redirect in n/a

Critical 9.1 Published 20 Feb 2026 Updated 23 Feb 2026

Attackers can poison password reset links via Host header injection, potentially leading to account takeover in Monica CRM.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-26747?

CVE-2026-26747 is a critical vulnerability in n/a, published on 20 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A Host Header Poisoning vulnerability exists in Monica 4.1.2 due to improper handling of the HTTP Host header in app/Providers/AppServiceProvider.php, combined with the default misconfiguration where the "app.force_url" is not set and default is "false". The application generates absolute URLs (such as those used in password reset emails) using the user-supplied Host header. This allows remote attackers to poison the password reset link sent to a victim,

Weakness: CWE-644

Which versions are affected by CVE-2026-26747?

It affects 1 product.

Products include Monicahq Monica.

How do I fix CVE-2026-26747?

No fix has been published for CVE-2026-26747 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-26747 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26747 exists.

Sources

Also known as GHSA-xf4f-qj26-72pf.