Medium severity · published Oct 3, 2026
CVE-2026-105119
OpenAM before 16.1.3 PKCE Enforcement Bypass via OAuth 2.0 Hybrid Flows
6.8
CVSS
0.2%
EPSS
No
On KEV
Description
OpenAM before 16.1.3 applies its OAuth2 Provider PKCE enforcement only to authorization requests whose response_type is exactly code, so codes issued through OpenID Connect hybrid flows (code token, code id_token, code token id_token) carry no bound challenge. An attacker who intercepts such a code can redeem it for a public client's tokens with any non-empty code_verifier.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenAM · OpenIdentityPlatform
before 16.1.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-105119
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-105119
vendor-advisory
https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-5p2f-7vcr-6vfh
third-party-advisory
https://www.vulncheck.com/advisories/openam-before-16.1.3-pkce-enforcement-bypass-via-oauth-2.0-hybrid-flows
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