CVE-2026-90936 froxlor CVE debrief

Who should care

Defenders managing Froxlor installations, especially those using versions prior to 2.3.7, should assess exposure and prioritize verification and potential upgrades. This includes reviewing compensating controls, monitoring for suspicious activity, and verifying Froxlor version and exposure. Security teams and vulnerability management teams should also review the vulnerability and its potential impact on their systems.

Why it matters

CVE-2026-90936 is a medium-severity vulnerability in Froxlor that allows authenticated attackers to enumerate global sender alias IDs and read other customers' allowed sender values. Defenders managing Froxlor installations should assess exposure, prioritize verification, and consider upgrading to version 2.3.7 or later.

• Potential enumeration of global sender alias IDs
• Unauthorized reading of other customers' allowed sender values
• Verification of Froxlor version and exposure
• Prioritization of upgrades to version 2.3.7 or later

Technical summary

Froxlor versions prior to 2.3.7 are vulnerable to improper sender alias lookup in customer_email.php. Authenticated attackers can exploit this to enumerate global sender alias IDs and read other customers' allowed sender values. The vulnerability impacts Froxlor installations, particularly those using versions prior to 2.3.7, and requires verification and potential upgrades. Defenders should prioritize verifying exposure and assessing the impact of this vulnerability on their systems. The CVE record and NVD entry provide details on the vulnerability, including its description and CVSS score.

Defensive priority

Defenders should prioritize verifying exposure and assessing the impact of this vulnerability on their systems, especially if using Froxlor versions prior to 2.3.7.

Recommended defensive actions

• Verify Froxlor version and upgrade to 2.3.7 or later if necessary
• Restrict access to customer_email.php and validate user input
• Monitor for suspicious activity related to sender alias enumeration
• 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
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description and CVSS score. However, the exact scope of affected systems and potential exploitation remain unclear. Defenders should verify Froxlor version and exposure, and consider upgrading to version 2.3.7 or later. The vulnerability allows authenticated attackers to enumerate global sender alias IDs and read other customers' allowed sender values.

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.