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TI-2026-85964 Aliases CVE-2026-123784GHSA-c5cr-c2wq-j45j

OS command injection in Fluxbox style background values

Priority LOW 38CWE-78Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-78.

Summary

Fluxbox through 1.3.7 contains an OS command injection flaw in RootTheme::reconfigTheme(). Shell metacharacters embedded in style background values, such as pixmap paths, random directories or gradient texture text, are concatenated unescaped into a command that runs when the style loads. A local attacker who can supply a crafted style file can run commands, and user interaction is required.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

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.

Why it matters now

EPSS 0.00708 53rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
fluxboxfluxboxup to 1.3.7—No fix listedCNA
  • fluxbox Vendorfluxbox Affected up to 1.3.7 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for fluxbox.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Timeline

  1. 2026-11-06 Threatist record created from CVE-2026-123784
  2. 2026-11-06 Alias added: GHSA-c5cr-c2wq-j45j
  3. 2026-11-08 Priority changed: MEDIUM → LOW

References

Patch 2

Other 2

  • TI-2026-85965 Infinite loop in Fluxbox menu update via style geometry CVSS 4.0MEDIUM 6.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences