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CVE-2026-77560— Tinyauth: forward-auth per-app ACL is matched case-sensitively against the (case-insensitive) hostname, letting an authenticated user reach apps they are not on the allowlist for

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 5.1.2, Tinyauth compares forwarded hostnames case-sensitively while reverse proxies route equivalent hostnames case-insensitively, allowing an authenticated low-privilege user to bypass per-app a

CVSS 8.1 · High EPSS 0.33% · P27

Affected Version Matrix 1

VendorProduct Version RangeStatus
tinyauthapp tinyauth < 5.1.2 affected
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I. Basic Information for CVE-2026-77560

Vulnerability Information

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Vulnerability Title
Tinyauth: forward-auth per-app ACL is matched case-sensitively against the (case-insensitive) hostname, letting an authenticated user reach apps they are not on the allowlist for
Source: CVE Program / CVE List V5
Vulnerability Description
Tinyauth is an authentication and authorization server. Prior to 5.1.2, Tinyauth compares forwarded hostnames case-sensitively while reverse proxies route equivalent hostnames case-insensitively, allowing an authenticated low-privilege user to bypass per-app access controls with a differently cased hostname. The lookup in internal/service/access_controls_service.go through lookupStaticACLs and GetAccessControls, and the Docker-label fallback in internal/service/docker_service.go through GetLabels, can miss the configured app and return an empty access-control object. internal/controller/proxy_controller.go proxyHandler then treats the empty user, group, OAuth, LDAP, and IP restrictions as permissive and returns an authenticated result for an app that should exclude the user. Unauthenticated users remain subject to login, and global login-time allowlists are not bypassed. This issue is fixed in version 5.1.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
大小写敏感处理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tinyauthapp tinyauth < 5.1.2 -

II. Public POCs for CVE-2026-77560

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III. Intelligence Information for CVE-2026-77560

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Patches & Fixes for CVE-2026-77560 (2)

Other References for CVE-2026-77560 (2)

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

CVE-2026-77582 6.9 MEDIUM Tinyauth: User enumeration attack by timing oracle
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-178

V. Comments for CVE-2026-77560

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