What’s Vulnerable › Vulnerabilities

CVE-2020-15233: OAuth2 Redirect URL validity does not respect query parameters and character casing for loopback addresses

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-02 · updated 2026-06-17
• Weakness: CWE-20

Description

ORY Fosite is a security first OAuth2 & OpenID Connect framework for Go. In Fosite from version 0.30.2 and before version 0.34.1, there is an issue in which an an attacker can override the registered redirect URL by performing an OAuth flow and requesting a redirect URL that is to the loopback adapter. Attackers can provide both custom URL query parameters to their loopback redirect URL, as well as actually overriding the host of the registered redirect URL. These attacks are only applicable in scenarios where the attacker has access over the loopback interface. This vulnerability has been patched in ORY Fosite v0.34.1.

Affected products

• ory fosite: from 0.30.2 before 0.34.1 — fixed in 0.34.1

How to fix

Upgrade to a fixed version: ory fosite 0.34.1. Check the vendor advisory for mitigations.

References

• https://github.com/ory/fosite/commit/cdee51ebe721bfc8acca0fd0b86b030ca70867bf
• https://github.com/ory/fosite/security/advisories/GHSA-rfq3-w54c-f9q5
• https://github.com/ory/fosite/commit/cdee51ebe721bfc8acca0fd0b86b030ca70867bf
• https://github.com/ory/fosite/security/advisories/GHSA-rfq3-w54c-f9q5

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