WildFly Core: Improper sensitivity classification in deployment-operation (CVE-2026-12977)

CVE-2026-12977 is a privilege escalation vulnerability within the deployment-operation family of WildFly Core. The flaw originates from improper sensitivity classification in specific handlers, such as upload-deployment-url. This oversight allows an authenticated user assigned to the restricted "Maintainer" role to access configuration files that should be protected. Successful exploitation can lead to the exfiltration of credentials stored within these configurations, subsequently enabling an attacker to escalate privileges to "SuperUser" (full administrative control) over the server.

Impact

An attacker with valid "Maintainer" level credentials can read unauthorized configuration files, exfiltrate sensitive credential material, and perform a full privilege escalation to "SuperUser," resulting in complete administrative control over the affected WildFly Core instance.

Recommendation

• Identify all instances of WildFly Core within the environment and audit current user assignments to the "Maintainer" role.
• Review vendor security bulletins from Red Hat for the release of a patched version of WildFly Core and apply updates across all production environments immediately upon availability.
• Monitor administrative audit logs for unusual deployment operations, specifically those initiated by accounts with restricted or "Maintainer" level roles.