🛡️ CVE-2026-48717 — openam-oauth2

⚪ Unknown ✅ No Known Exploit CWE-285 OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

OpenAM OAuth Authorization Bypass via PKCE Challenge

Summary

Description

An Improper Authorization (CWE-285) issue in OpenAM's OAuth2 authorization-code grant allows a PKCE-protected authorization code to be redeemed without the required code_verifier. This affects OpenAM Community Edition through version 16.0.6 and was patched in version 16.1.1.

The authorize endpoint stores a code_challenge on the issued code, but the token endpoint only requires a code_verifier when the realm-wide codeVerifierEnforced setting is enabled, which ships disabled by default. With that setting off, the stored challenge is checked only if the caller supplies a verifier, so omitting the parameter skips PKCE verification entirely.

Impact

OpenAM Community Edition deployments through version 16.0.6 using the default OAuth2 provider configuration are potentially affected. For public clients, an attacker who intercepts an authorization code can exchange it for tokens without knowing the verifier. For confidential clients, the attacker additionally needs client authentication material or an execution context that can redeem the code. A token request supplying an incorrect verifier is still rejected. The bypass is specifically the missing-parameter path.

Patch

This has been patched in OpenAM Community Edition version 16.1.1. Users are encouraged to update to the latest release.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity high, availability none.

Weakness class

CVE-2026-48717 is classified as CWE-285: Improper Authorization. A request is carried out without confirming that the caller is permitted to perform it on that specific resource.

Affected software

CVE-2026-48717 is recorded against 1 package.

  • org.openidentityplatform.openam:openam-oauth2 (fixed in 16.1.1)

Timeline and source

Published on 29 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Package)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
CWE CWE-285
Public Exploit ✅ No
Source OSV
Published 2026-06-29
Updated 2026-08-12
Modified 2026-06-29
Fix URL N/A

Affected Packages

Software From version Fixed in
org.openidentityplatform.openam:openam-oauth2 — 16.1.1

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