CVE-2026-123784
HIGH
NVD
CVSS Score
7.8
Severity
HIGH
Published
Nov 06, 2026
Vendor
unknown
Description
Fluxbox through 1.3.7 contains an OS command injection vulnerability in RootTheme::reconfigTheme() that allows attackers to execute commands via crafted style background values. Attackers can embed shell metacharacters in background pixmap paths, random directories, or gradient texture text, which are concatenated unescaped into an fbsetbg command run via $SHELL -c when the style loads.
References
- https://github.com/fluxbox/fluxbox
- https://github.com/fluxbox/fluxbox/blob/Release-1_3_7/src/RootTheme.cc#L192-L264
- https://github.com/fluxbox/fluxbox/commit/270bfbc28573037c9b8458488d193b219e33889f
- https://github.com/fluxbox/fluxbox/pull/89
- https://www.vulncheck.com/advisories/fluxbox-through-1.3.7-os-command-injection-via-style-background-values