CVE-2026-18255 Red Hat CVE debrief

Who should care

Defenders responsible for Red Hat Quay instances should assess exposure to read-only superusers and potential impact of robot account impersonation. This includes reviewing instance configurations, assessing potential security risks, and updating access controls to prevent unauthorized access to robot account tokens. Additionally, operators, platform administrators, and security teams may need to review and update their security measures to mitigate the风险.

Why it matters

Defenders should prioritize verifying exposure of Quay instances to read-only superusers and assess the impact of potential robot account impersonation.

• Potential impersonation of robot accounts by read-only superusers.
• Unauthorized access to robot account tokens for repositories.

Technical summary

A flaw in Red Hat Quay allows a user configured in GLOBAL_READONLY_SUPER_USERS to view robot account tokens for repositories they are not a member of. This could enable an attacker with read-only superuser privileges to impersonate any robot account, potentially leading to unauthorized access and other security issues. The issue arises from inadequate access controls, allowing read-only superusers to access sensitive robot account tokens. Defenders should prioritize verifying exposure of Quay instances to read-only superusers and assess the impact of potential robot account impersonation.

Defensive priority

Defenders should prioritize verifying exposure of Quay instances to read-only superusers and assess the impact of potential robot account impersonation.

Recommended defensive actions

• Verify Quay instance configuration to ensure read-only superusers cannot access robot account tokens for unauthorized repositories.
• Assess the impact of potential robot account impersonation on Quay instance security.
• Review and update Quay instance access controls to prevent unauthorized access to robot account tokens.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and NVD entry provide details on the flaw in Red Hat Quay, but do not specify versions or provide remediation guidance. To verify exposure, defenders should review Quay instance configurations and assess potential impact of robot account impersonation. Evidence is limited, and further verification tasks are needed to confirm affected scope and severity.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.