Summary
SMTP misconfiguration leading to "Forgot Password" exploit that leaks registered user email.
Explanation of the vulnerability
Two different error messages was shown, based on if the user exists or not when using the forgot password functionality, when the SMTP was configured but do not response.
Impact
A user enumeration attack is possible when SMTP is not setup correctly, but reset password is enabled
CVE-2023-49274 has a CVSS score of 3.7 (Low). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (8.18.10, 10.8.1, 12.3.4); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Umbraco.CMS to 8.18.10 or later; Umbraco.CMS to 10.8.1 or later; Umbraco.CMS to 12.3.4 or later
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is CVE-2023-49274? CVE-2023-49274 is a low-severity security vulnerability in Umbraco.CMS (nuget), affecting versions >= 8.0.0, < 8.18.10. It is fixed in 8.18.10, 10.8.1, 12.3.4.
- How severe is CVE-2023-49274? CVE-2023-49274 has a CVSS score of 3.7 (Low). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of Umbraco.CMS are affected by CVE-2023-49274? Umbraco.CMS (nuget) versions >= 8.0.0, < 8.18.10 is affected.
- Is there a fix for CVE-2023-49274? Yes. CVE-2023-49274 is fixed in 8.18.10, 10.8.1, 12.3.4. Upgrade to this version or later.
- Is CVE-2023-49274 exploitable, and should I be worried? Whether CVE-2023-49274 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2023-49274 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2023-49274?
- Upgrade
Umbraco.CMSto 8.18.10 or later - Upgrade
Umbraco.CMSto 10.8.1 or later - Upgrade
Umbraco.CMSto 12.3.4 or later
- Upgrade