CVE-2026-77560
- Source
- https://cve.org/CVERecord?id=CVE-2026-77560
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77560.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-77560
- Aliases
- Published
- 2026-09-21T16:39:18Z
- Modified
- 2026-09-23T03:47:00Z
- Severity
-
- 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
- Summary
- 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
- Details
-
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.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-178", "CWE-636", "CWE-863" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77560.json" }- References
-
- https://github.com/tinyauthapp/tinyauth/releases/tag/v5.1.2
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77560.json
- https://github.com/tinyauthapp/tinyauth/security/advisories/GHSA-328g-jx67-v94g
- https://nvd.nist.gov/vuln/detail/CVE-2026-77560
- https://github.com/tinyauthapp/tinyauth/commit/80bc87188ec3aabc5104c249eaa7b997973b9275
- https://github.com/tinyauthapp/tinyauth/commit/e75605b2c534ec83525a33603e16d76baca13399
- https://github.com/tinyauthapp/tinyauth/pull/1000
- https://github.com/tinyauthapp/tinyauth/pull/1028
Affected packages
Git / github.com/tinyauthapp/tinyauth
Affected ranges
- Type
- GIT
- Repo
- https://github.com/tinyauthapp/tinyauth
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "introduced": "0" }, { "fixed": "5.1.2" } ], "source": [ "AFFECTED_FIELD", "REFERENCES" ] }