CVE-2026-18147 Red Hat CVE debrief

Who should care

IdM administrators and users, security teams, and IT personnel responsible for FreeIPA/IdM deployments should assess exposure and prioritize remediation. Additionally, operators, platform administrators, vulnerability management teams, and security teams should be aware of the potential impact and take necessary actions to protect their systems.

Why it matters

CVE-2026-18147 is a DOM Cross-Site Scripting (XSS) vulnerability in the FreeIPA/IdM Web UI password reset page. Defenders should prioritize verifying exposure, assessing security controls, and applying patches or mitigations to prevent potential full administrative control and actions within authenticated sessions.

• Potential for full administrative control if an IdM administrator is targeted
• Ability for attackers to perform actions within the victim's authenticated session
• Need for verification of affected versions and deployment contexts
• Priority for applying patches or mitigations to prevent exploitation

Technical summary

The FreeIPA/IdM Web UI password reset page is vulnerable to DOM Cross-Site Scripting (XSS). An attacker could inject and execute arbitrary JavaScript code by enticing a victim to click a specially crafted link and complete a password reset. The vulnerability allows attackers to perform actions within the victim's authenticated session, potentially leading to full administrative control if an IdM administrator is targeted. Defenders should prioritize verifying exposure, assessing security controls, and applying patches or mitigations.

Defensive priority

Defenders should prioritize verifying exposure of IdM administrators and users, assessing the effectiveness of current security controls, and applying patches or mitigations.

Recommended defensive actions

• Verify exposure of IdM administrators and users to the vulnerable password reset page
• Assess the effectiveness of current security controls, such as input validation and output encoding
• Apply patches or mitigations provided by the vendor, if available
• Monitor for suspicious activity and implement additional security measures as needed
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on affected versions, exploitation, and remediation is limited. Defenders should verify the affected scope, assess security controls, and apply patches or mitigations. The vulnerability has been publicly disclosed, but further details are not available. Additional research and verification are necessary to understand the full impact.

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.