CVE-2026-77711
When Jetty's `HttpClient` make a request to a server through a forward proxy, the server may reply…
- Risk score
- 59/100
- CVSS
- 8.2 v4.0
- Exploit chance (30 days)
- 0.3%
- Published
- 15 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- When Jetty's HttpClient make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required). The client mistakenly interprets the 407 as coming from the proxy, so it re-sends the request with the Proxy-Authentication header, which arrives to the server, that now has acce…
- Affected
- See advisory
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 8.2 high
- Remotely exploitable without logging in
References
Original description
When Jetty's `HttpClient` make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required). The client mistakenly interprets the 407 as coming from the proxy, so it re-sends the request with the `Proxy-Authentication` header, which arrives to the server, that now has access to the proxy credentials.
Last activity 15 Oct 2026. Patch Forecast updates every hour.