Is CVE-2026-93523 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-93523?

CVE-2026-93523 has a CVSS v3 severity of HIGH (7.8).

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CVE-2026-93523

Description

A heap buffer overflow caused by a XIPassiveUngrabDevice request with an out-of-range modifier value in X.Org X Server before 21.1.15 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.