Is CVE-2026-26747 in the CISA KEV catalog?

No. CVE-2026-26747 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-26747?

CVE-2026-26747 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2026-26747?

CVE-2026-26747 has an EPSS score of 0.39% (31th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-26747?

No published fix for CVE-2026-26747 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-26747

CRITICAL

9.1

CVSS v3

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,

CWE-644

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

TridentStack Control tracks known vulnerabilities across your Windows, macOS, and Linux fleet and shows the fix as soon as one is published. See how it works

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.39%probability of exploitation in 30 days

31stpercentile

Low risk: more likely to be exploited than 31% of all known CVEs.

References

Exploit1

github.com

Product1

github.com

Related Vulnerabilities

Other CWE-644 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-6031	High	8.8	2.8%	-	-
CVE-2021-21265	Medium	6.8	1.7%	-	Fix
CVE-2021-41114	Medium	4.8	1.2%	-	Fix
CVE-2021-20784	Medium	6.1	1.1%	-	Fix
CVE-2020-6982	High	8.8	1.1%	-	-
CVE-2024-1064	High	7.5	0.8%	-	-

Embed a live status badge for CVE-2026-26747

Markdown

[![CVE-2026-26747](https://tridentstack.com/cve/badge/CVE-2026-26747.svg)](https://tridentstack.com/cve/CVE-2026-26747)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-26747"><img src="https://tridentstack.com/cve/badge/CVE-2026-26747.svg" alt="CVE-2026-26747"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-26.