CVE-2020-5811 is a medium-severity path traversal vulnerability in UmbracoCms (nuget), affecting versions < 8.9.2. It is fixed in 8.9.2.
An authenticated path traversal vulnerability exists during package installation in Umbraco CMS <= 8.9.1 or current, which could result in arbitrary files being written outside of the site home and expected paths when installing an Umbraco package.
Input manipulates file paths to reach files outside the intended directory, such as configuration or credential files. Typical impact: unauthorized file read or write outside the intended directory.
CVE-2020-5811 has a CVSS score of 6.5 (Medium). The vector is network-reachable, low 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 (8.9.2). Upgrading removes the vulnerable code path.
nuget
UmbracoCms (< 8.9.2)UmbracoCms → 8.9.2 (nuget)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 instead of chasing every advisory.
Kodem's runtime-powered SCA identifies whether CVE-2020-5811 is reachable in your applications. Explore open-source security for your team.
See if CVE-2020-5811 is reachable in your applications. Get a demo
Upgrade UmbracoCms to 8.9.2 or later to resolve this vulnerability.
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2020-5811 is a medium-severity path traversal vulnerability in UmbracoCms (nuget), affecting versions < 8.9.2. It is fixed in 8.9.2. Input manipulates file paths to reach files outside the intended directory, such as configuration or credential files.
CVE-2020-5811 has a CVSS score of 6.5 (Medium). 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.
UmbracoCms (nuget) versions < 8.9.2 is affected.
Yes. CVE-2020-5811 is fixed in 8.9.2. Upgrade to this version or later.
Whether CVE-2020-5811 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
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.
Upgrade UmbracoCms to 8.9.2 or later.