Bug 2562339 (CVE-2026-116684)
| Summary: | CVE-2026-116684 mcp: mcp: Authentication bypass via missing token audience validation | ||
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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: | alinfoot, anpicker, anthomas, bbrownin, blitton, dfreiber, dkeler, drow, dschmidt, dtrifiro, ebourniv, ehelms, ggainey, hasun, ilpinto, jburrell, jfula, jlanda, jowilson, jpasqual, juwatts, jwong, kaycoth, kshier, ltomasbo, mbarnett, mdellweg, mhayden, mhulan, mwoodson, nmoumoul, nyancey, omaciel, ometelka, osousa, pcreech, ptisnovs, rbobbitt, rchan, rjohnson, sbunciak, sdoran, simaishi, smallamp, stcannon, suppawar, syedriko, thason, tmalecek, vkumar, weaton, xdharmai, yguenane, ykashtan |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | --- | |
| Doc Text: |
A flaw was found in the Model Context Protocol (MCP) Python SDK. This vulnerability allows a remote authenticated attacker to bypass authentication and gain unauthorized access to an MCP server by presenting a valid token issued for a different service. The issue occurs because server-side authentication does not independently validate the token's target audience claim when multiple resources share an authorization server.
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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
2026-10-27 19:22:00 UTC
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