Tinyauth vulnerable to TOTP/2FA bypass via OIDC authorize endpoint
Priority HIGH 70CWE-287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-287.
Summary
Tinyauth is an authentication and authorization server. Prior to 5.0.3, the OIDC authorization endpoint allows users with a TOTP-pending session (password verified, TOTP not yet completed) to obtain authorization codes. An attacker who knows a user's password but not their TOTP secret can obtain valid OIDC tokens, completely bypassing the second factor. This vulnerability is fixed in 5.0.3.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00307 23rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed tinyauth (steveiliop56): 5.0.3github.com/steveiliop56/tinyauth (Go): 1.0.1-20260311144920-9eb2d33064b7
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| steveiliop56 | tinyauth | before 5.0.3 | 5.0.3 | Patch available | CNA |
| — | github.com/steveiliop56/tinyauth (Go) | before 1.0.1-20260311144920-9eb2d33064b7 | 1.0.1-20260311144920-9eb2d33064b7 | Patch available | GHSA-3q28-qjrv-qr39 |
- tinyauth Vendorsteveiliop56 Affected before 5.0.3 Fixed in 5.0.3 Patch available CNA
- github.com/steveiliop56/tinyauth (Go) Vendor— Affected before 1.0.1-20260311144920-9eb2d33064b7 Fixed in 1.0.1-20260311144920-9eb2d33064b7 Patch available GHSA-3q28-qjrv-qr39
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:tinyauth:tinyauth:*:*:*:*:*:*:*:* | up to 5.0.2 | Vulnerable | steveiliop56 |
- cpe:2.3:a:tinyauth:tinyauth:*:*:*:*:*:*:*:* Versions up to 5.0.2 Vulnerable ·steveiliop56
Remediation
- Fix · CNA tinyauth (steveiliop56) Fixed in 5.0.3
- Fix · GHSA-3q28-qjrv-qr39 github.com/steveiliop56/tinyauth (Go) Fixed in 1.0.1-20260311144920-9eb2d33064b7 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-32246
- 2026-10-03 Alias added: GHSA-3q28-qjrv-qr39
References
More steveiliop56 Tinyauth vulnerabilities
- TI-2026-25937 Tinyauth has OAuth account confusion via shared mutable state on singleton service instances CVSS 3.1HIGH 7.7
- TI-2026-24774 Tinyauth's OIDC authorization codes are not bound to client on token exchange CVSS 3.1MEDIUM 6.5
Sources
- CVE-2026-32246 · CVE Program
- CVE-2026-32246 · NVD
- FIRST EPSS
- GHSA-3q28-qjrv-qr39 · GitHub Advisory Database · CC BY 4.0
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