CVE-2026-78428
CVSS v3
8
HIGH
EPSS Score
0.3 %
exploit probability, as of 2026-09-28
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
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
Technical details
- Published
- 2026-09-17
- Last Modified
- 2026-09-17
Frequently asked questions
What is CVE-2026-78428?
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
Is CVE-2026-78428 actively exploited?
Active exploitation of CVE-2026-78428 has not been confirmed. Its EPSS score was 0.3% on 2026-09-28, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2026-78428?
CVE-2026-78428 has a CVSS v3 base score of 8 (HIGH severity).
Is CVE-2026-78428 affecting your environment?
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