CVE-2026-107638 ph7software CVE debrief

Who should care

Defenders responsible for pH7Builder installations, particularly those using two-factor authentication, should assess exposure and prioritize verification and remediation. This includes operators, administrators, and security teams managing pH7Builder deployments. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance, and plan vendor-supported updates or mitigations through normal change

Why it matters

CVE-2026-107638 allows attackers to bypass two-factor authentication in pH7Builder before 18.5.0, potentially leading to account takeover. Defenders should prioritize verification and remediation.

• Attackers who know an account password can submit unlimited 6-digit verification codes to VerificationCodeFormProcess.php to take over member, affiliate, or administrator accounts
• Defenders must verify and upgrade to version 18.5.0 or later to prevent exploitation
• Defenders should monitor for suspicious login attempts to detect potential exploitation

Technical summary

pH7Builder before 18.5.0 contains an improper restriction of authentication attempts vulnerability in VerificationCodeFormProcess.php, allowing attackers to bypass two-factor authentication by guessing TOTP codes without limits. This vulnerability affects member, affiliate, or administrator accounts. Attackers who know an account password can submit unlimited 6-digit verification codes to take over accounts. Defenders should prioritize verifying and upgrading to version 18.5.0 or later, and monitoring for suspicious login attempts.

Defensive priority

Defenders should prioritize verifying and upgrading to version 18.5.0 or later, and monitoring for suspicious login attempts.

Recommended defensive actions

• Verify and upgrade to version 18.5.0 or later
• Monitor for suspicious login attempts
• Implement additional security measures for two-factor authentication
• 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 source item provide details on the vulnerability, but limited information is available on exploitation or affected systems. Defenders should verify and upgrade to version 18.5.0 or later, and monitor for suspicious login attempts. The vulnerability allows attackers to submit unlimited 6-digit verification codes to VerificationCodeFormProcess.php to take over accounts. Evidence of exploitation is not provided, and defenders should prioritize verification and remediation.

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.