CVE-2026-32245 json
Tinyauth's OIDC authorization codes are not bound to client on token exchange
published 2026-03-12 7 mo ago modified 2026-06-17 4 mo ago also GHSA-xg2q-62g2-cvcm , GO-2026-4689 , EUVD-2026-11679
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 22%
- public exploits
- 0
- none known
Summary
Tinyauth is an authentication and authorization server. Prior to 5.0.3, the OIDC token endpoint does not verify that the client exchanging an authorization code is the same client the code was issued to. A malicious OIDC client operator can exchange another client's authorization code using their own client credentials, obtaining tokens for users who never authorized their application. This violates RFC 6749 Section 4.1.3. This vulnerability is fixed in 5.0.3.
Patch / fix
- go github.com/steveiliop56/tinyauth 1.0.1-20260311144920-9eb2d33064b7
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260317T205859-150000.1.152.1
suse advisories SUSE-SU-2026:1042-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/steveiliop56/tinyauth/security/advisories/GHSA-xg2q-62g2-cvcm referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/steveiliop56/tinyauth | <1.0.1-20260311144920-9eb2d33064b7 all versions |
1.0.1-20260311144920-9eb2d33064b7 |
Affected products
- steveiliop56 tinyauth
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
github.com
/steveiliop56/tinyauth/commit/b2a1bfb1f532e87f205fa3afa3fc9f148c53ab89
web, patch
-
github.com
/steveiliop56/tinyauth/security/advisories/GHSA-xg2q-62g2-cvcm
web, exploit, third-party-advisory, advisory
-
github.com
/steveiliop56/tinyauth/releases/tag/v5.0.3
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-32245
advisory
-
github.com
/steveiliop56/tinyauth
package
-
pkg.go.dev
/vuln/GO-2026-4689
web
Sources
- CVE List CVE-2026-32245
- GitHub Advisory GHSA-xg2q-62g2-cvcm
- NVD CVE-2026-32245
- OSV GO-2026-4689
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