Relative Path Traversal in Microsoft .NET Framework - CVE-2026-65810

Vulnerability identifier: #VU141984

CSH Severity: High

CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-65810

CWE-ID: CWE-23

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to escalate privileges.

The vulnerability exists due to relative path traversal in .NET Framework when processing crafted local input. A remote attacker can supply a crafted relative path to escalate privileges.

User interaction is required for exploitation.

Microsoft .NET Framework

Install security update from vendor's website.

Microsoft .NET Framework - addressed in versions 2.0.50727.8984 & 3.0.30729.8980, 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4144.0, 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0, 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0, 2.0.50727.9183 & 3.0.30729.9169 & 4.8.4805.0, 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0, 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9344.0, 4.7.4144.0, 4.8.4805.0

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-65810
• https://support.microsoft.com/help/5120711

• Multiple vulnerabilities in Microsoft .NET Framework