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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,2026.1.11]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Server", "source": "cna", "vendor": "Devolutions"}, "product": "server", "vendor": "devolutions"}], "analysis": {"en": {"generated_at": "2026-04-02T04:38:54.552173+00:00", "value": {"mitigation_remediation": ["Upgrade Devolutions Server to a version later than 2026.1.11 where the OAuth authentication flow is fixed.", "If an immediate upgrade is not possible, restrict or disable external OAuth authentication for sensitive accounts.", "Monitor logs for suspicious login activity and enforce multi\u2011factor authentication for all privileged users."], "summary": {"action": "Apply Patch", "impact": "Account impersonation via reusing OAuth session codes"}, "threat_synthesis": {"affected_systems": "Devolutions Server 2026.1.11 and all earlier releases of the Devolutions Server product.", "description_and_impact": "The vulnerability is an improper authentication flaw in the external OAuth authentication flow of Devolutions Server version 2026.1.11 and earlier. It allows an authenticated user to reuse a session code from an external authentication flow and authenticate as any other user, including administrators. This flaw directly leads to unauthorized access, enabling an attacker to execute actions with the privileges of the impersonated account, potentially compromising confidentiality, integrity, or availability of the system.", "risk_and_exploitability": "The CVSS score of 5.4 reflects a medium severity. The exploitation requires an attacker to be already authenticated, which is a lower barrier than remote unauthenticated exploitation, but once authenticated they can impersonate privileged users. No EPSS score is available and the vulnerability is not listed in the CISA KEV catalog. The likely attack vector is an authenticated, possibly local user re\u2011using the session code; further exploitation may require the attacker to have knowledge of existing session codes or to intercept them during the OAuth flow."}}}}, "created": "2026-04-02T07:49:05.154696+00:00", "title": "Improper Authentication in Devolutions Server OAuth Flow Allows User Impersonation", "updated": "2026-04-02T20:17:29.979565+00:00", "vendors": ["devolutions", "devolutions$PRODUCT$server"]}