Is CVE-2026-55655 actively exploited?

No active exploitation of CVE-2026-55655 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-55655 be exploited remotely?

No. CVE-2026-55655 requires local access to exploit.

What is the CVSS score of CVE-2026-55655?

CVE-2026-55655 has a CVSS score of 6.1 (MEDIUM).

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MEDIUM

CVE-2026-55655

CWE-923Published: June 23, 2026· Updated: Jun 25, 2026

6.1

CVSS v3.1

EPSS:0.09%probability of exploitation in 30 daysPercentile:0.6th

Official Description

A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by pre-binding the preferred abstract X socket name when X11 forwarding is enabled and a local UNIX-domain X socket is used. A successful attack can compromise the confidentiality of forwarded X11 traffic, including sensitive window contents and input, and may allow some manipulation of the forwarded session.

NVD Source

Technical Analysis

CVE-2026-55655 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.1.