CVE-2026-26747
CRITICALDescription
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,
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.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 32% of all known CVEs.
References
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% | - | - |
Common questions
How do I fix 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.
Is CVE-2026-26747 being actively exploited?
Not that we know of. CVE-2026-26747 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.39% is the estimated probability that it will be exploited in the next 30 days. That is higher than 32% of all scored CVEs.
How severe is CVE-2026-26747?
CVE-2026-26747 has a CVSS v3 base score of 9.1, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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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.