CVE-2026-32242 in parse-server
Summary
by MITRE • 03/12/2026
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.11 and 8.6.37, Parse Server's built-in OAuth2 auth adapter exports a singleton instance that is reused directly across all OAuth2 provider configurations. Under concurrent authentication requests for different OAuth2 providers, one provider's token validation may execute using another provider's configuration, potentially allowing a token that should be rejected by one provider to be accepted because it is validated against a different provider's policy. Deployments that configure multiple OAuth2 providers via the oauth2: true flag are affected. This vulnerability is fixed in 9.6.0-alpha.11 and 8.6.37.
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Analysis
by VulDB Data Team • 03/15/2026
This vulnerability affects Parse Server versions prior to 9.6.0-alpha.11 and 8.6.37, where the built-in OAuth2 authentication adapter suffers from a critical design flaw involving singleton instance management. The flaw stems from the implementation where a single singleton instance is shared across all OAuth2 provider configurations rather than maintaining separate instances for each provider. This architectural weakness creates a fundamental security risk when multiple OAuth2 providers are configured through the oauth2: true flag, as the authentication system fails to properly isolate the validation contexts for different providers.
The technical implementation issue manifests when concurrent authentication requests are processed for different OAuth2 providers simultaneously. Under these conditions, the token validation process for one provider can inadvertently use the configuration parameters of another provider due to the shared singleton instance. This cross-contamination of validation contexts allows tokens that should be rejected by one provider's specific security policies to be accepted because they are validated against different provider configurations. The vulnerability represents a classic case of improper resource isolation and configuration management in authentication systems.
The operational impact of this vulnerability is significant as it undermines the fundamental security guarantees of multi-provider OAuth2 implementations. Attackers could potentially exploit this flaw to bypass provider-specific security controls, such as audience restrictions, issuer validation, or token expiration policies that are unique to each OAuth2 provider. This creates a scenario where a malicious actor could authenticate using tokens from one provider that would normally be rejected by another provider's validation rules, effectively weakening the entire authentication framework. The risk is particularly elevated in environments where organizations rely on multiple OAuth2 providers for different user groups or security domains.
Security professionals should immediately upgrade to Parse Server versions 9.6.0-alpha.11 or 8.6.37 to remediate this vulnerability. Organizations currently running affected versions should conduct thorough audits of their OAuth2 configurations to identify any multi-provider setups that may be at risk. The fix addresses the core architectural issue by ensuring that each OAuth2 provider maintains its own isolated validation context rather than sharing a single singleton instance. This remediation aligns with security best practices for authentication system design and follows principles outlined in CWE-362, which addresses concurrent execution issues in security contexts. The vulnerability also relates to ATT&CK technique T1566, which involves credential access through authentication process manipulation, as it allows for bypassing authentication controls through improper configuration handling. Organizations should also review their overall authentication architecture to ensure proper isolation of security contexts, particularly in multi-provider scenarios, to prevent similar issues from arising in other components of their security infrastructure.