---
cve: "CVE-2026-77582"
severity: "MEDIUM"
cvss: 6.9
epss: "2.6%"
vendor: "tinyauthapp"
kev: false
exploited: false
published: "2026-09-21 17:18:53"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-22T00:28:20+02:00"
---

# CVE-2026-77582

> 6.9 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Referenzen

- <https://github.com/tinyauthapp/tinyauth/security/advisories/GHSA-456h-ww26-f758>
- <https://github.com/tinyauthapp/tinyauth/pull/1004>
- <https://github.com/tinyauthapp/tinyauth/commit/c22925c2fba981875d0a2b09dd3ee41c0ae4c310>
- <https://github.com/tinyauthapp/tinyauth/releases/tag/v5.1.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-77582) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_