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

Source: https://junglewise.ai/threats/cve-2026-103028-sftpgo-source-side-file-pattern-filter-bypass-during-copy  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-15  
License: CC BY 4.0 with a link back

CVE-2026-103028 · Severity: medium · CVSS 4.3 · Published 2026-10-13

SFTPGo is a secure file transfer server that uses file pattern filters to restrict access to sensitive files. An authenticated user can bypass these filters during copy operations by copying denied files to permitted names, allowing them to read restricted content that should be hidden from them.

Technologies: [github.com/drakkan/sftpgo (Go)](https://junglewise.ai/threats/technologies/github-com-drakkan-sftpgo), [github.com/drakkan/sftpgo/v2 (Go)](https://junglewise.ai/threats/technologies/github-com-drakkan-sftpgo-v2). Vendors: [Drakkan](https://junglewise.ai/threats/vendors/drakkan), [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-103028 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-103028 being exploited in the wild.

**How severe is CVE-2026-103028?** Medium severity, with a CVSS score of 4.3, published 13 October 2026.

**Which products and versions are affected?** Drakkan SFTPGo 2.5.0 through 2.7.5; github.com/drakkan/sftpgo (Go) SEMVER:introduced=0; github.com/drakkan/sftpgo/v2 (Go) >= 2.5.0, <= 2.7.5, SEMVER:introduced=2.5.0,fixed=2.7.6.

**Is there a fix for CVE-2026-103028?** Yes. github.com/drakkan/sftpgo/v2 (Go): upgrade to 2.7.6 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-103028 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-103028?** Check whether you run Drakkan SFTPGo, github.com/drakkan/sftpgo (Go) or github.com/drakkan/sftpgo/v2 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/drakkan/sftpgo/v2 (Go): upgrade to 2.7.6 or later

  ```sh
  go get github.com/drakkan/sftpgo/v2@v2.7.6
  ```


## Technical details

The vulnerability is an incorrect authorization check (CWE-863) where file pattern filters are evaluated only on the copy destination, not the source. An authenticated user with copy permissions can exploit this by copying files matching denied_patterns to names matching allowed_patterns, then reading the copied content. The attack requires existing authentication and access to both source and destination paths; no other access controls or administrative capabilities are bypassed.

## Affected products

- drakkan SFTPGo 2.5.0 through 2.7.5

## Identifiers

- CVE-2026-103028
- GHSA-wwv9-g5x4-966q
- GO-2026-6802

## Timeline

- 2026-09-19: disclosed
- 2026-10-15: advisory
- 2026-10-15: patched: Version 2.7.6 released

## References

- [https://api.github.com/users/arpitjain099](https://api.github.com/users/arpitjain099)

## Related threats

- [SFTPGo denial of service via malformed SSH channel request](https://junglewise.ai/threats/cve-2026-77375-sftpgo-denial-of-service-via-malformed-ssh-channel-request)
- [SFTPGo stored XSS via inline parameter in file downloads](https://junglewise.ai/threats/cve-2026-49245-sftpgo-stored-xss-via-inline-parameter-in-file-downloads)
- [SFTPGo path confinement bypass in public share ZIP download](https://junglewise.ai/threats/cve-2026-49244-sftpgo-path-confinement-bypass-in-public-share-zip-download)
- [GO-2026-4697 - SFTPGo improperly sanitizes placeholders in group home directories/key prefixes in github.com/drakkan/sftpgo](https://junglewise.ai/threats/cve-2026-30915-sftpgo-improperly-sanitizes-placeholders-in-group-home)
- [SFTPGo Vulnerable to Path Traversal and Permission Bypass via Path Normalization Discrepancy](https://junglewise.ai/threats/cve-2026-30914-sftpgo-vulnerable-to-path-traversal-and-permission-bypass-via)