CVE-2026-26747

CRITICAL EPSS 30.9%
Published Feb 20, 20264mo ago · Modified Jun 17, 20261w ago
9.1 CVSS 3.1
Critical
Find Similar
Published Feb 20, 2026 4mo ago
Last Modified Jun 17, 2026 1w ago

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,

CVSS Details

Base Score
9.1
Exploitability
3.9
Impact
5.2
Vector string
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

Threat Intelligence

EPSS Exploit Probability
30.9% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 1

CWE-644

Affected Products 1

VendorProductVersionRange
monicahqmonica4.1.2any

References 2

  • github.com https://github.com/hungnqdz/cve-research/blob/main/CVE-2026-26747.md
    ExploitVendor Advisory
  • github.com https://github.com/monicahq/monica
    Product

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.