CVE-2026-63770: Glanceapp Glance

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Glanceapp Glance: up to and including 0.8.5

Published 2026-07-20. Last modified 2026-08-21.