How severe is CVE-2026-77582?

CVE-2026-77582 has a CVSS 4.0 base score of 6.9, rated medium severity.

Is CVE-2026-77582 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-77582?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-77582 published?

CVE-2026-77582 was published on 2026-09-21 and last updated on 2026-09-30.

CVE-2026-77582

CVE-2026-77582 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-208.

Key facts

Severity: Medium (CVSS 4.0 base score 6.9)
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-208
Published: 2026-09-21
Last modified: 2026-09-30

Description

Tinyauth is an authentication and authorization server. Prior to 5.1.0, Tinyauth exposes a remotely observable timing difference between authentication attempts for existing and nonexistent local usernames. internal/controller/user_controller.go loginHandler and internal/middleware/context_middleware.go basicAuth return quickly after internal/service/auth_service.go reports a missing user, while an existing user causes bcrypt password verification work. Repeated measurements can therefore disclose valid usernames and support targeted credential attacks. This issue is fixed in version 5.1.0.

Frequently asked questions

What is CVE-2026-77582?: Tinyauth is an authentication and authorization server. Prior to 5.1.0, Tinyauth exposes a remotely observable timing difference between authentication attempts for existing and nonexistent local usernames. internal/controller/user_controller.go loginHandler and internal/middleware/context_middleware.go basicAuth return quickly after internal/service/auth_service.go reports a missing user, while an existing user causes bcrypt password verification work. Repeated measurements can therefore disclose valid usernames and support targeted credential attacks. This issue is fixed in version 5.1.0.
How severe is CVE-2026-77582?: CVE-2026-77582 has a CVSS 4.0 base score of 6.9, rated medium severity.
Is CVE-2026-77582 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-77582?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-77582 published?: CVE-2026-77582 was published on 2026-09-21 and last updated on 2026-09-30.

References

Other CWE-208 vulnerabilities

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CVE-2026-16315 — High (CVSS 8.7): OMICRON StationGuard before version 4.10 contains a cryptographic timing side-channel vulnerability in the backend…
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