CVE-2026-42164 Mahara CVE debrief

Who should care

Organizations using Mahara, particularly those with exposed Text block/section functionality, should be aware of this vulnerability and take steps to patch or mitigate. This includes reviewing and updating Mahara Text block/section functionality configurations and monitoring for potential content exposure. Security teams and vulnerability management teams should prioritize patching to prevent potential content exposure. Additionally, operators and platform administrators should be aware of the vulnerability and its potential impact on their systems and data. They should also review their asset inventory and consider implementing compensating controls for exposed systems while remediation is scheduled and verified. Furthermore, they should check relevant monitoring, detection, and logs for exposed assets that need extra review. IT teams responsible for change management and incident response should also be informed to ensure a coordinated response to this vulnerability. Lastly, audit and compliance teams may need to verify that appropriate measures are being taken to address this vulnerability and ensure compliance with organizational policies and regulatory requirements. This may involve reviewing vendor guidance, assessing the vulnerability's impact on the organization's systems and data, and implementing controls to mitigate the risk of exploitation. By taking these steps, organizations can reduce the risk of exploitation and minimize potential damage in the event of an attack. The vulnerability's high CVSS score of 9.8 and critical severity rating emphasize the importance of prompt action to address this vulnerability and prevent potential content exposure. Organizations should also consider their overall security posture and ensure that they have adequate defenses in place to protect against potential attacks. This may involve reviewing their incident response plan, conducting vulnerability assessments, and implementing additional security controls as needed. By prioritizing patching and taking proactive measures to address this vulnerability, organizations can help protect their systems and data from potential exploitation and minimize the risk of security

Technical summary

The CVE-2026-42164 vulnerability affects Mahara versions before 25.04.5 and 26.04.0, allowing crafted calls to recall backed-up content from another Text section. The vulnerability has a CVSS score of 9.8 and is considered CRITICAL. The vulnerability is related to the Text block/section functionality in Mahara. Organizations should prioritize patching to prevent potential content exposure. This involves reviewing and updating Mahara Text block/section functionality configurations and monitoring for potential content exposure. Security teams and vulnerability management teams should prioritize patching to prevent potential content exposure. Additionally, operators and platform administrators should be aware of the vulnerability and its potential impact on their systems and data.

Defensive priority

Organizations using Mahara should prioritize patching to prevent potential content exposure.

Recommended defensive actions

• Apply patches for Mahara versions 25.04.5 and 26.04.0 or later
• Review and update Mahara Text block/section functionality configurations
• Monitor for potential content exposure

Evidence notes

The CVE description indicates Mahara versions before 25.04.5 and 26.04.0 are vulnerable in the Text block/section functionality. The NVD entry is currently Deferred. Organizations should verify their deployments and review configurations to ensure they are not exposed. Defensive measures include monitoring for potential content exposure and reviewing compensating controls.

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.