Description An improper access check allows unauthorized access to webservice endpoints. Remediation References CVE-2026-23899 Related Vulnerabilities SharePoint CVE-2021-40482 Vulnerability (CVE-2021-40482) WordPress Plugin Downloads Manager 'upload.php' Arbitrary File Upload (0.2) WordPress Plugin Catch Import Export Security Bypass (1.8) Atlassian Jira Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Vulnerability (CVE-2021-26082) WordPress Plugin W3 Total Cache PHP Code Injection (0.9.2.8) Severity High Classification CVE-2026-23899 CWE-284 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Tags Missing Update Known Vulnerabilities