CVE-2026-30459

HighPublic PoC

Published: 16 April 2026

Published

16 April 2026

Modified

23 April 2026

KEV Added

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Patch

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CVSS Score 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N

EPSS Score 0.0005 14.4th percentile

Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-30459 is a high-severity Weak Password Recovery Mechanism for Forgotten Password (CWE-640) vulnerability in Thedaylightstudio Fuel Cms. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 14.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 IA-5 (Authenticator Management) and SI-10 (Information Input Validation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Directly remediates the flaw in FuelCMS's Forgot Password feature that allows unauthenticated attackers to obtain victim password reset tokens via crafted links.

IA-5 Authenticator Management good match

prevent

Mandates secure management of authenticators like password reset tokens, preventing their unauthorized generation or exposure during the reset process.

SI-10 Information Input Validation good match

prevent

Validates untrusted inputs from crafted email links and HTTP headers in the password reset mechanism, blocking the poisoning attack vector.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1078 Valid Accounts Stealth

Adversaries may obtain and abuse credentials of existing accounts as a means of gaining Initial Access, Persistence, Privilege Escalation, or Defense Evasion.

attack.mitre.org →

Why these techniques?

The vulnerability is an unauthenticated flaw in a public-facing web application's password reset feature (Host header poisoning), directly enabling exploitation via T1190. Successful token capture leads to account compromise, facilitating T1078 Valid Accounts abuse.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v18.1

NVD Description

An issue in the Forgot Password feature of Daylight Studio FuelCMS v1.5.2 allows unauthenticated attackers to obtain the password reset token of a victim user via a crafted link placed in a valid e-mail message.

Deeper analysisAI

CVE-2026-30459 affects the Forgot Password feature in Daylight Studio FuelCMS version 1.5.2. The vulnerability enables unauthenticated attackers to obtain a victim user's password reset token through a crafted link embedded in a valid email message. It carries a CVSS v3.1 base score of 7.1 (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N) and maps to CWE-640.

Unauthenticated attackers (PR:N) can exploit this issue over the network with low complexity by sending a targeted email containing the crafted link. Successful exploitation requires user interaction (UI:R), such as the victim clicking the link, after which the attacker obtains the password reset token. This results in low confidentiality impact but high integrity impact, potentially allowing account compromise.

References for mitigation and further details include vendor sites at http://daylight.com and http://fuelcms.com, the relevant source code in the Login.php controller at https://github.com/daylightstudio/FUEL-CMS/blob/master/fuel/modules/fuel/controllers/Login.php, and a pentest report on password reset poisoning at https://pentest-tools.com/PTT-2025-029-Password-Reset-Poisoning-via-Host-Header.pdf.