CVE Tools
Sign in

CVE-2026-26747

Published: Feb 20, 2026Updated: Feb 26, 2026 Sources: CVE List NVDCWE-644
NVD MITRE
9.1CVSSCRITICAL
EPSS Score
0.4%
Top 69.3%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-644

Affected Products

monicamonicahq
SaaS
Enterprise Software / crm
n/an/a
monicahqoss-projectEnterprise Softwareaka monica

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

References

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

Timeline

Published
Feb 20, 2026
Last Updated
Feb 26, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-26747 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows