Bug 2454826 (CVE-2026-27124)
| Summary: | CVE-2026-27124 FastMCP: FastMCP OAuthProxy: FastMCP OAuthProxy: Unauthorized actions due to improper consent validation in GitHub OAuth | ||
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| Product: | [Other] Security Response | Reporter: | OSIDB Bzimport <bzimport> |
| Component: | vulnerability | Assignee: | Product Security DevOps Team <prodsec-dev> |
| Status: | NEW --- | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | abarbaro, alizardo, anthomas, dfreiber, drow, ehelms, ggainey, jburrell, jchui, jhe, jkoehler, juwatts, ktsao, lphiri, mbarnett, mhayden, mhulan, nboldt, nmoumoul, osousa, pcreech, psrna, rchan, rjohnson, sdoran, smallamp, tmalecek, vkumar |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | --- | |
| Doc Text: |
A flaw was found in FastMCP and FastMCP OAuthProxy. The OAuthProxy, used for GitHub OAuth authentication, does not properly validate a user's consent after receiving an authorization code from GitHub. This, combined with GitHub's behavior of skipping the consent page for previously authorized clients, creates a Confused Deputy vulnerability. This vulnerability could allow a remote attacker to perform unauthorized actions by exploiting the OAuth flow.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | Type: | --- | |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
OSIDB Bzimport
2026-04-03 16:02:53 UTC
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