# CVE-2026-63770

## Summary

- **CVE ID:** CVE-2026-63770
- **Severity:** HIGH
- **CVSS Score:** 8.2 (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-348
- **Published:** Jul 20, 2026
- **Last Modified:** Aug 21, 2026

## 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 (0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.29%
- **EPSS Percentile:** 21.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._