Unrated severityNVD Advisory· Published Feb 20, 2026· Updated Feb 23, 2026

CVE-2026-26747

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,

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Monica/Monicacpe-rescue2 versions
(expand)+ 1 more
- (no CPE)
- (no CPE)range: =4.1.2

Patches

Vulnerability mechanics

References

github.com/hungnqdz/cve-research/blob/main/CVE-2026-26747.mdmitre

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