Which versions of PHP are affected by CVE-2026-4592?

Organizations using A security vulnerability should be aware of moderate risk from CVE-2026-4592, a improper authentication vulnerability rated CVSS 5.6.

Is there a public PoC exploit available for CVE-2026-4592?

Yes, a public proof-of-concept exploit is available for CVE-2026-4592. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-4592?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Audit authentication configurations.

PHP CVE-2026-4592

Q: What is the CVSS score of CVE-2026-4592?

CVE-2026-4592 has a CVSS 4.0 base score of 2.9 (Low). CVSS vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.1%.

EUVD-2026-14459 LOW

Improper Authentication (CWE-287)

2026-03-23 VulDB

PHP Authentication Bypass

2.9

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

2.9 LOW

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Severity Changed

Apr 29, 2026 - 01:11 NVD

MEDIUM LOW

CVSS changed

Apr 29, 2026 - 01:11 NVD

6.3 (MEDIUM) 2.9 (LOW)

CVSS changed

Apr 24, 2026 - 16:37 NVD

5.6 (MEDIUM) 6.3 (MEDIUM)

PoC Detected

Mar 24, 2026 - 15:54 vuln.today

Public exploit code

EUVD ID Assigned

Mar 23, 2026 - 16:15 euvd

EUVD-2026-14459

Analysis Generated

Mar 23, 2026 - 16:15 vuln.today

CVE Published

Mar 23, 2026 - 15:56 nvd

MEDIUM 5.6

DescriptionCVE.org

A security vulnerability has been detected in kalcaddle kodbox 1.64. This impacts the function loginAfter/tfaVerify of the file /workspace/source-code/plugins/client/controller/tfa/index.class.php of the component Password Login. The manipulation leads to improper authentication. The attack is possible to be carried out remotely. The attack is considered to have high complexity. The exploitability is said to be difficult. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

AnalysisAI

Improper authentication in the two-factor authentication verification function of Kalcaddle Kodbox 1.64 allows remote attackers to bypass login controls with high complexity exploitation. Public exploit code exists for this vulnerability, and the vendor has not provided a patch despite early notification. Affected users should implement network-level access controls while awaiting a vendor update.

Technical ContextAI

The vulnerability is classified as CWE-287 (Improper Authentication), a foundational authentication bypass flaw in the TFA verification logic of Kodbox. The affected component is the PHP-based TFA controller located at /workspace/source-code/plugins/client/controller/tfa/index.class.php, specifically the loginAfter/tfaVerify function. Kodbox (cpe:2.3:a:kalcaddle:kodbox) is a PHP-based file management and collaboration platform; the vulnerability exploits a weakness in how the two-factor authentication verification process validates user credentials after initial login, potentially allowing attackers to circumvent the secondary authentication factor that should protect against unauthorized account access.

RemediationAI

The primary remediation is to upgrade Kalcaddle Kodbox to a version newer than 1.64 if available; however, given the vendor's non-response to disclosure, verify patch availability directly from Kalcaddle or monitor https://vuldb.com/?id.352428 for vendor response. If an immediate patch is unavailable, implement compensating controls: restrict Kodbox access to trusted IP ranges via network firewall or WAF, enforce strong password policies to reduce likelihood of compromise, monitor authentication logs for suspicious TFA verification failures or bypass attempts, and consider disabling direct remote access to Kodbox until a patch is confirmed available. If possible, disable the affected TFA endpoint at the reverse proxy level while maintaining alternative authentication controls.