CVE-2026-23760 — SmarterTools SmarterMail versions prior to build 9511 contain an authentication

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 administra

01What is this vulnerability?

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…

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2026-01-26. Ransomware use: Known.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2026-01-22T15:16:55.120
• Last modified: 2026-08-04T05:16:38.160
• Added to CISA KEV: 2026-01-26

09References

• code-white.com — https://code-white.com/public-vulnerability-list/#authenticationserviceforcerese…
• labs.watchtowr.com — https://labs.watchtowr.com/attackers-with-decompilers-strike-again-smartertools-…
• www.smartertools.com — https://www.smartertools.com/smartermail/release-notes/current
• www.vulncheck.com — https://www.vulncheck.com/advisories/smartertools-smartermail-authentication-byp…
• www.cisa.gov — https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-…
• www.huntress.com — https://www.huntress.com/blog/smartermail-account-takeover-leading-to-rce