CVE-2026-26747

CRITICAL
2026-02-20 [email protected]
9.1
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 22:04 vuln.today
PoC Detected
Feb 26, 2026 - 02:42 vuln.today
Public exploit code
CVE Published
Feb 20, 2026 - 17:25 nvd
CRITICAL 9.1

Tags

PHP Monica

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,

Analysis

Host Header Poisoning in Monica 4.1.2 CRM. PoC available.

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Remediation

Within 24 hours: Identify all Monica instances in use and their versions; isolate affected systems from production if possible and disable password reset functionality. Within 7 days: Implement network segmentation to restrict access to Monica instances, deploy WAF rules to detect password reset link manipulation attempts, and notify users to change passwords via secure alternate channels. …

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Priority Score

66
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +46
POC: +20

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CVE-2026-26747 vulnerability details – vuln.today
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