CVE-2026-23760
SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API
- Critical 9.3
- Exploited: added to CISA KEV 26 Jan 2026
- Used in ransomware campaigns
- A public exploit reference is listed
Description
SmarterTools SmarterMail versions prior to build 9511 contain an authentication bypass 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. An unauthenticated attacker can supply a target administrator username and a new password to reset the account, resulting in full administrative compromise of the SmarterMail instance. NOTE: SmarterMail system administrator privileges grant the ability to execute operating system commands via built-in management functionality, effectively providing administrative (SYSTEM or root) access on the underlying host.
Key facts
- Published
- 22 Jan 2026
- Last changed
- 4 Aug 2026
- Assigned by
- VulnCheck
- KEV added
- 26 Jan 2026
- KEV fix due
- 16 Feb 2026
- Used in ransomware
- Yes, according to CISA
- EPSS
- 96.432% likely to be exploited in the next 30 days, higher than 99.882% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: yes; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 9.3CVSS 4.0, Criticalfrom the CNA (VulnCheck)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| SmarterTools | SmarterMail |
|
Timeline
- 22 Jan 2026 Published
- 26 Jan 2026 Added to the CISA KEV catalogue