Vulnerability in Glanceapp Glance
CVE-2026-63770
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (20.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Glanceapp Glance — versions 0
Weakness classification (CWE)
References
- github.com/glanceapp/glance/issues/1031 (issue-tracking, technical-description, exploit)
- github.com/glanceapp/glance/pull/1033 (issue-tracking, patch)
- www.vulncheck.com/advisories/glance-ip-spoofing-authentication-brute-force-prot… (third-party-advisory)
- github.com/glanceapp/glance/commit/3f20e8d9d0b1983892632649f35fd00c7b4ea8b6 (patch)
Frequently asked questions
- What is CVE-2026-63770?
- CVE-2026-63770 is a high-severity vulnerability in Glanceapp Glance, classified under CWE-348. CVSS score: 7.5/10. Published 2026-07-20.
- How severe is CVE-2026-63770?
- High severity. CVSS v3 base score is 7.5 out of 10.