CVE-2026-87705

HIGH
Published Oct 13, 2026 Modified Oct 16, 2026 CWE-940

Description

Improper verification of source of a communication channel in Windows Hyper-V allows an unauthorized attacker to bypass a security feature over an adjacent network.

Is your site exposed to CVE-2026-87705?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

7.4
HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS — Exploit Prediction

0.0035
Probability of exploitation
0.27%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-940 CWE-940

References

Frequently Asked Questions

What is CVE-2026-87705? +
Improper verification of source of a communication channel in Windows Hyper-V allows an unauthorized attacker to bypass a security feature over an adjacent network. It has a CVSS v3.1 base score of 7.4 (HIGH).
How severe is CVE-2026-87705? +
CVE-2026-87705 has a CVSS v3.1 score of 7.4 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0035, placing it in the 0th percentile for exploitation probability.
How do I check if I'm vulnerable to CVE-2026-87705? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-55660

Tina is a headless content management system. In versions prior to @tinacms/app 2.5.6 and tinacms 3.9.3, cross-origin postMessage handlers and …
CVE-2026-101897

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. From 1.20.0 until …
CVE-2026-102511

Improper Verification of Source of a Communication Channel in the ADS discovery of the Go implementation of Apache PLC4X (PLC4Go) …
CVE-2025-9999

Some payload elements of the messages sent between two stations in a networking architecture are not properly checked on the …
CVE-2026-59786

Zabbix Server and Proxy accept the active agent heartbeat message regardless of the configured PSK or certificate authentication. This means …
CVE-2025-61932 9.8

Lanscope Endpoint Manager (On-Premises) (Client program (MR) and Detection agent (DA)) improperly verifies the origin of incoming requests, allowing an …

Don't wait for an exploit

Scan your website for vulnerabilities like CVE-2026-87705 — free, no signup required.