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GHSA-3vcg-pv95-pq54
github.com/drakkan/sftpgo/v2Summary
The inline query parameter on the browsable-share file download and on the authenticated user file download suppressed Content-Disposition: attachment, so an HTML file stored in a share or home directory could be served as text/html and execute in SFTPGo's web origin (stored XSS).
Impact
Low. Exploitation requires the attacker to place the file and a victim to open the crafted link — a URL the WebClient never generates, so it requires social engineering — and the practical conditions are narrow:
- Session cookies are HttpOnly, so the cookie cannot be read by the injected script.
- Authenticated shares set their own session cookie, which overwrites the victim's WebClient cookie, no account pivot. The realistic case is a public share, or a folder shared between distinct users combined with targeted social engineering.
It is a genuine trust-boundary violation (SFTPGo emits attacker-controlled content as active HTML in its own origin), hence an advisory, but the constrained preconditions and the HttpOnly mitigation keep it Low.
Patches
Upgrade to v2.7.3. These endpoints now always respond with Content-Disposition: attachment; the inline parameter has been removed. See the fix commit for the full technical rationale.
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The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs basic access or low-level privileges. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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