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Vulnerability record · CVE-2026-26747 · published 20 February 2026

CVE-2026-26747: Monicahq monica vulnerability

Monicahq · Monica

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,

9.1 CVSS 3.1 Critical EPSS 0.57% · top 55.0% CWE-644 · CWE-644
9.1CVSS 3.1 base score
0.57%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2024-54996Monicahq monica cross-site scripting vulnerabilityMonicaHQ v4.1.2 was discovered to contain multiple authenticated Client-Side Injection vulnerabilities via the title and description parameters at /p…EPSS 0.80%8.8CVE-2023-1094Monicahq monica cross-site scripting vulnerabilityMonicaHQ version 4.0.0 allows an authenticated remote attacker to execute malicious code in the application via CSTI in the `people:id/food` endpoint…EPSS 1.2%8.8CVE-2023-1031Monicahq monica cross-site scripting vulnerabilityMonicaHQ version 4.0.0 allows an authenticated remote attacker to execute malicious code in the application via CSTI in the `settings` endpoint and f…EPSS 1.4%6.5CVE-2024-54999Monicahq monica code injection vulnerabilityMonicaHQ v4.1.2 was discovered to contain a Client-Side Injection vulnerability via the last_name parameter the General Information module.EPSS 0.40%6.5CVE-2024-54994Monicahq monica cross-site scripting vulnerabilityMonicaHQ v4.1.2 was discovered to contain multiple Client-Side Injection vulnerabilities via the first_name and last_name parameters in the Add a new…EPSS 0.31%5.4CVE-2024-54951Monicahq monica cross-site scripting vulnerabilityMonica 4.1.2 is vulnerable to Cross Site Scripting (XSS). A malicious user can create a malformed contact and use that contact in the "HOW YOU MET" c…EPSS 0.50%5.4CVE-2024-54997Monicahq monica code injection vulnerabilityMonicaHQ v4.1.1 was discovered to contain an authenticated Client-Side Injection vulnerability via the entry text field at /journal/entries/ID/edit.EPSS 0.28%5.4CVE-2024-54998Monicahq monica cross-site scripting vulnerabilityMonicaHQ v4.1.2 was discovered to contain an authenticated Client-Side Injection vulnerability via the Reason parameter at /people/h:[id]/debts/creat…EPSS 0.37%

Source: NIST National Vulnerability Database (record CVE-2026-26747), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.