CVE-2026-103028 SFTPGo source-side file-pattern filter bypass during copy operations
Authenticated users can bypass file-pattern filters during copy operations to read restricted files or reproduce hidden contents in allowed locations.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-103028?
CVE-2026-103028 is a medium-severity missing authorization vulnerability in drakkan sftpgo, published on 13 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-103028?
4 open source packages ship an affected version, including github.com/drakkan/sftpgo/v2 and github.com/drakkan/sftpgo.
| Package | Affected | Fixed in |
|---|---|---|
github.com/drakkan/sftpgo/v2 Go | From 2.5.0 | 2.7.6 |
github.com/drakkan/sftpgo/v2 Go | From 2.5.0 | 2.7.6 |
github.com/drakkan/sftpgo/v2 Go | From 2.5.0 | 2.7.6 |
github.com/drakkan/sftpgo Go | All versions | None |
How do I fix CVE-2026-103028?
Upgrade github.com/drakkan/sftpgo/v2 to 2.7.6 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-103028 being exploited?
There is no known exploitation of CVE-2026-103028 in the wild and no public exploit code.
Sources
Also known as GHSA-wwv9-g5x4-966q, GO-2026-6802.