CVE-2026-63770 Glance 0.8.5 IP Spoofing Authentication Brute-Force Protection Bypass
Attackers can bypass brute-force lockout protections in Glance by spoofing IP addresses via the X-Forwarded-For header when proxying is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-63770?
CVE-2026-63770 is a high-severity vulnerability in glanceapp glance, published on 20 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Glance through 0.8.5 contains an IP address spoofing vulnerability in the authentication handler that allows unauthenticated attackers to bypass brute-force lockout protections by supplying arbitrary values in the X-Forwarded-For request header when the server proxied option is enabled. Attackers can manipulate the leftmost value of the X-Forwarded-For header to make each login attempt appear to originate from a distinct IP address, preventing the per-IP failed-login counter from reaching the lockout threshold and enabling unlimited credential guessing against the authentication endpoint.
Weakness: CWE-348
Which versions are affected by CVE-2026-63770?
How do I fix CVE-2026-63770?
No fix has been published for CVE-2026-63770 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-63770 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63770 exists.
Sources
Also known as GHSA-jmgq-484h-mrfw.