CVE-2026-78428
HIGHDescription
For users authenticated through SAML or OpenID Connect (OIDC), this vulnerability can result in one user receiving another user's authenticated session when multiple SSO login attempts occur concurrently
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Exploit Intelligence
EPSS data unavailable for this CVE.
References
Related Vulnerabilities
Other CWE-384 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2018-11714 | Critical | 9.8 | 68% | - | - |
| CVE-2018-18925 | Critical | 9.8 | 31% | - | - |
| CVE-2019-12258 | High | 7.5 | 23% | - | Fix |
| CVE-2018-17199 | High | 7.5 | 21% | - | Fix |
| CVE-2024-50339 | Medium | 5.3 | 20% | - | Fix |
| CVE-2019-10008 | High | 8.8 | 19% | - | - |
Common questions
How do I fix CVE-2026-78428?
No published fix for CVE-2026-78428 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
How severe is CVE-2026-78428?
CVE-2026-78428 has a CVSS v3 base score of 8.0, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-17.