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Exploited vulnerability · CISA KEV

Is CVE-2026-23760 exploited? Yes: in CISA KEV since 26 Jan 2026

Gociux · SmarterTools SmarterMail · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-23760, SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 26 Jan 2026, 4 days after it was published. It is known to be used in ransomware campaigns. It affects SmarterTools SmarterMail. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 26 Jan 2026
ransomwareKnownused in campaigns
EPSStop 1%among the most likely CVEs to be exploited
severity9.3CVSS 4.0 · critical
US federal due16 Feb 2026BOD 22-01 deadline

What it is

SmarterTools SmarterMail contains an authentication bypass using an alternate path or channel vulnerability in the password reset API. The force-reset-password endpoint permits anonymous requests and fails to verify the existing password or a reset token when resetting system administrator accounts. This could allow an unauthenticated attacker to supply a target administrator username and a new password to reset the account, resulting in full administrative compromise of the SmarterMail instance.

VendorSmarterTools (3 exploited CVEs in KEV)
ProductSmarterMail
VulnerabilitySmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability
WeaknessCWE-288
Published22 Jan 2026
Added to KEV26 Jan 2026
Reported by (CNA)VulnCheck

What to do

  1. Check whether you run it. Look for SmarterMail in your asset inventory, including appliances and cloud images. Stack check lists every exploited SmarterTools CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 22 Jan 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for SmarterTools.

Other exploited CVEs in SmarterMail

References

Questions

Is CVE-2026-23760 being exploited?

Yes. CISA added CVE-2026-23760 to the Known Exploited Vulnerabilities catalog on 26 Jan 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-23760 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2026-23760?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check SmarterTools's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected SmarterMail and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in January 2026 · SmarterTools scorecard · act-now radar.

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