Vulnerability · Published Jul 20, 2026 · Assigned by VulnCheck

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

High 7.5

In plain English

A high-severity security flaw in glance from glanceapp. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.3%top 77.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
glanceapp	glance	0 – through 0.8.5

Weakness: CWE-348 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Researcher Disclosure technical-description, exploit, issue-tracking
Pull Request issue-tracking, patch
Patch Commit patch
https://www.vulncheck.com/advisories/glance-ip-spoofing-authentication-brute-force-protection-bypass third-party-advisory