Improper Certificate Validation in Xen - CVE-2026-42491
Published: July 14, 2026
Vulnerability identifier: #VU137514
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-42491
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Xen Project
Affected software:
Xen
Xen
Detailed vulnerability description
The vulnerability allows a remote attacker to intercept communications and disclose sensitive information or tamper with data in transit.
The vulnerability exists due to improper certificate validation in HTTP handlers in the XAPI C# and Powershell SDKs when opening a separate connection to the XAPI host. A remote attacker can perform a man-in-the-middle attack on network communication to intercept communications and disclose sensitive information or tamper with data in transit.
Successful exploitation may expose a session token and affect exported or imported disk images, host backups, RRD performance data, and patches or updates transferred over these connections.
How to mitigate CVE-2026-42491
Install security update from vendor's website.