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CVE-2026-77582— Tinyauth: User enumeration attack by timing oracle

Quick assessment

Affected
tinyauthapp tinyauth
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 a

CVSS 6.9 · Medium EPSS 0.38% · P32

Affected Version Matrix 1

VendorProduct Version RangeStatus
tinyauthapp tinyauth < 5.1.0 affected
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I. Basic Information for CVE-2026-77582

Vulnerability Information

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Vulnerability Title
Tinyauth: User enumeration attack by timing oracle
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tinyauthapp tinyauth < 5.1.0 -

II. Public POCs for CVE-2026-77582

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III. Intelligence Information for CVE-2026-77582

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Patches & Fixes for CVE-2026-77582 (2)

Other References for CVE-2026-77582 (2)

Same Patch Batch · tinyauthapp · 2026-09-21 · 3 CVEs total

CVE-2026-77560 8.1 HIGH Tinyauth: forward-auth per-app ACL is matched case-sensitively against the (case-insensiti
CVE-2026-77561 5.3 MEDIUM Tinyauth: Unauthenticated login attempts can trigger global login lockdown denial of servi

IV. Related Vulnerabilities

Same product: tinyauth
Same vendor: tinyauthapp
Same weakness: CWE-208

V. Comments for CVE-2026-77582

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