www.vulncheck.com CVE-2026-123784: OS Command Injection Vulnerability in Fluxbox
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- •CVE-2026-123784 allows OS command injection in Fluxbox up to version 1.3.7.
- •Attackers can exploit the vulnerability through crafted style background values.
- •Linux desktops using Fluxbox are primarily affected, with a CVSS score of 8.5.
A newly disclosed vulnerability, CVE-2026-123784, affects Fluxbox versions up to 1.3.7, allowing OS command injection through crafted style background values. Attackers can exploit this flaw by embedding shell metacharacters in background pixmap paths, which are executed via the fbsetbg command. The risk is particularly high for Linux desktops and workstations using Fluxbox, where users may inadvertently load malicious themes. Successful exploitation could enable attackers to read or alter data, install persistence, or disrupt user sessions. The vulnerability has a CVSS score of 8.5, indicating a high severity level. Currently, there is no confirmed exploitation in the wild, and the urgency for patching remains uncertain. Users are advised to review style files for potential threats and restrict theme imports until a patch is applied. The vulnerability was published on November 6, 2026.
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