glanceapp glance up to 0.8.5 authentication handler X-Forwarded-For Remote Code Execution

Summaryinfo

A vulnerability, which was classified as critical, has been found in glanceapp glance up to 0.8.5. Affected is an unknown function of the component authentication handler. This manipulation of the argument X-Forwarded-For causes Remote Code Execution. This vulnerability is handled as CVE-2026-63770. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in glanceapp glance up to 0.8.5 and classified as critical. Affected by this vulnerability is an unknown functionality of the component authentication handler. The manipulation of the argument X-Forwarded-For with an unknown input leads to a remote code execution vulnerability. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-63770 since 07/18/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/20/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• glanceapp

Name

• glance

Version

• 0.8.0
• 0.8.1
• 0.8.2
• 0.8.3
• 0.8.4
• 0.8.5

Website

• Product: https://github.com/glanceapp/glance/

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