CVE-2026-56224: Capgo - Login CSRF and Session Fixation via URL Query Parameters

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-30 · updated 2026-07-01
Weakness: CWE-384

Description

Capgo console.capgo.app/login before 12.128.2 accepts access_token and refresh_token in URL query parameters, automatically authenticating users without confirmation. Attackers can craft malicious links to force victims into attacker-controlled sessions, exposing tokens in browser history and logs.

Affected products

Capgo: before 12.128.2 — fixed in 12.128.2

How to fix

Upgrade to a fixed version: Capgo 12.128.2. Check the vendor advisory for mitigations.

References

https://github.com/Cap-go/capgo/security/advisories/GHSA-83f5-439g-pwmj
https://www.vulncheck.com/advisories/capgo-login-csrf-and-session-fixation-via-url-query-parameters
https://github.com/Cap-go/capgo/security/advisories/GHSA-83f5-439g-pwmj

Get alerted when CVE-2026-56224 or the next vulnerability affects your stack