Vulnerability · Published Oct 3, 2026 · Assigned by VulnCheck

CVE-2026-105119OpenAM before 16.1.3 PKCE Enforcement Bypass via OAuth 2.0 Hybrid Flows

Medium 6.8

In plain English

A medium-severity security flaw in OpenAM from OpenIdentityPlatform. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).

Severity (CVSS 3.1)6.8Medium

Exploit odds (30 days)0.2%top 90.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
OpenIdentityPlatform	OpenAM	0 – before 16.1.3

Weakness: CWE-285 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

References

GitHub Security Advisory (GHSA-5p2f-7vcr-6vfh) vendor-advisory
VulnCheck Advisory: OpenAM before 16.1.3 PKCE Enforcement Bypass via OAuth 2.0 Hybrid Flows third-party-advisory