What’s Vulnerable › Vulnerabilities

CVE-2026-63770: Glance 0.8.5 IP Spoofing Authentication Brute-Force Protection Bypass

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-20 · updated 2026-10-24
• Weakness: CWE-348

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.

Affected products

• glanceapp glance: through 0.8.5

References

• https://github.com/glanceapp/glance/commit/3f20e8d9d0b1983892632649f35fd00c7b4ea8b6
• https://github.com/glanceapp/glance/issues/1031
• https://github.com/glanceapp/glance/pull/1033
• https://www.vulncheck.com/advisories/glance-ip-spoofing-authentication-brute-force-protection-bypass

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