CVE-2025-66625Medium· 4.9▾ SunlitUmbraco is an ASP.NET CMS. Due to unsafe handling and deletion of temporary files in versions 10.0.0 through 13.12.0, during the dictionary upload process an attacker with access to the backoffice can trigger predictable requests to temp…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 27 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.4%
Umbraco is an ASP.NET CMS. Due to unsafe handling and deletion of temporary files in versions 10.0.0 through 13.12.0, during the dictionary upload process an attacker with access to the backoffice can trigger predictable requests to temporary file paths. The application’s error responses (HTTP 500 when a file exists, 404 when it does not) allow the attacker to enumerate the existence of arbitrary files on the server’s filesystem. This vulnerability does not allow reading or writing file contents. In certain configurations, incomplete clean-up of temporary upload files may additionally expose the NTLM hash of the Windows account running the Umbraco application. This issue is fixed in version 13.12.1.
umbraco_cms >= 10.0.0, < 13.12.1Upgrade past the affected range:
umbraco_cms 13.12.1Connected by shared product, vendor, weakness, or advisory.
CVE-2021-47776Medium· 5.3Umbraco CMS v8.14.1 contains a server-side request forgery vulnerability that allows attackers to manipulate baseUrl parameters in multiple dashboard and help controller endpoints
CVE-2026-69197High· 8.7Umbraco is an ASP.NET CMS
GHSA-q3v2-xj35-9grxMedium· 4.9Umbraco.AI discloses sensitive application configuration values
CVE-2025-67288Critical· 10.0An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers to execute arbitrary code by uploading a crafted PDF file
CVE-2021-29429Medium· 4.0In Gradle before version 7.0, files created with open permissions in the system temporary directory can allow an attacker to access information downloaded by Gradle
CVE-2025-15065Medium· 6.3Exposure of Sensitive Information to an Unauthorized Actor, Missing Encryption of Sensitive Data, Files or Directories Accessible to External Parties vulnerability in Kings Information & Network Co