---
id: "CVE-2026-23760"
kind: "vulnerability"
aliases: ["CVE-2026-23760"]
title: "SmarterTools SmarterMail versions prior to build 9511 contain an authentication bypass vulnerability in the password\u2026"
severity: "critical"
cvss: 9.8
epss: null
exploited: true
status: "open"
category: "vendor"
products: [{"name": "smartertools smartermail", "fixed": ["100.0.9511"], "affected": "< 100.0.9511", "ecosystem": "vendor"}, {"name": "SmarterTools SmarterMail", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["cloudflare", "email", "exploited", "lab-disclosure", "ransomware", "self-hosted", "smartermail", "vendor"]
not_affected_if: ["managed-hosting"]
published_at: "2026-01-22T15:16:55+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-24T19:12:57+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-23760", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23760", "first_seen_at": "2026-10-23T23:44:51+00:00"}, {"source": "lab", "url": "https://developers.cloudflare.com/changelog/post/2026-03-02-waf-release/", "first_seen_at": "2026-10-24T19:12:57+00:00"}]
---

# SmarterTools SmarterMail versions prior to build 9511 contain an authentication bypass vulnerability in the password…

SmarterTools SmarterMail has an authentication bypass in its password reset API: the force-reset-password endpoint accepts anonymous requests and does not check the current password or a reset token for system administrator accounts. An unauthenticated attacker can reset an admin password and take full control of the mail server.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:smartertools smartermail affected < 100.0.9511 fixed 100.0.9511
- vendor:SmarterTools SmarterMail affected ? fixed ?

## Fix

Apply the vendor mitigation from SmarterTools; the sources do not name a fixed version. If no mitigation is available, CISA says to discontinue use of the product.

## Mitigated for you by

- Cloudflare (waf-rule, since 2026-03-02): covers HTTP requests proxied through Cloudflare, matched by the Cloudflare Managed Ruleset rule 'SmarterMail - Authentication Bypass - CVE-2026-23760' (action changed from Log to Block) Limits: Only traffic proxied through Cloudflare; requests reaching the origin directly are not covered; none further stated Still: Upgrade SmarterMail to build 9511 or later; the rule is a detection layer, not a fix https://developers.cloudflare.com/changelog/post/2026-03-02-waf-release/

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-23760
- 2026-10-23T23:44:51+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-23760
- 2026-10-24T19:12:57+00:00 lab https://developers.cloudflare.com/changelog/post/2026-03-02-waf-release/ — Cloudflare: WAF Release - 2026-03-02 · Changelog

## Documents

- [advisory] Cloudflare: WAF Release - 2026-03-02 · Changelog https://developers.cloudflare.com/changelog/post/2026-03-02-waf-release/

## From the sources

WAF Release - 2026-03-02 · Changelog

# Changelog

New updates and improvements at Cloudflare.

March 2, 2026

## WAF Release - 2026-03-02

This week's release introduces new detections for vulnerabilities in SmarterTools SmarterMail (CVE-2025-52691 and CVE-2026-23760), alongside improvements to an existing Command Injection (nslookup) detection to enhance coverage.

Key Findings

- CVE-2025-52691: SmarterTools SmarterMail mail server is vulnerable to Arbitrary File Upload, allowing an unauthenticated attacker to upload files to any location on the mail server, potentially enabling remote code execution.
- CVE-2026-23760: SmarterTools SmarterMail versions prior to build 9511 contain an authentication bypass vulnerability in the password reset API permitting unaunthenticated to reset system administrator accounts failing to verify existing password or reset token.

Impact

Successful exploitation of these SmarterMail vulnerabilities could lead to full system compromise or unauthorized administrative access to mail servers. Administrators are strongly encouraged to apply vendor patches without delay.

| Ruleset | Rule ID | Legacy Rule ID | Description | Previous Action | New Action | Comments |
| --- | --- | --- | --- | --- | --- | --- |
| Cloudflare Managed Ruleset | ...966ec6b1 | N/A | SmarterMail - Arbitrary File Upload - CVE-2025-52691 | Log | Block | This is a new detection. |
| Cloudflare Managed Ruleset | ...ee964a8c | N/A | SmarterMail - Authentication Bypass - CVE-2026-23760 | Log | Block | This is a new detection. |
| Cloudflare Managed Ruleset | ...75b64d99 | N/A | Command Injection - Nslookup - Beta | Log | Block | This rule is merged into the original rule "Command Injection - Nslookup" (ID: ...b090ba9a) |

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_