CVE-2018-1000842

Fat Free CRM vulnerable to Cross-site Scripting

FatFreeCRM version <=0.14.1, >=0.15.0 <=0.15.1, >=0.16.0 <=0.16.3, >=0.17.0 <=0.17.2, and ==0.18.0 contains a Cross Site Scripting (XSS) vulnerability in commit 6d60bc8ed010c4eda05d6645c64849f415f68d65 that can result in Javascript execution. This attack appears to be exploitable via Content with Javascript payload will be executed on end user browsers when they visit the page. This vulnerability appears to have been fixed in 0.18.1, 0.17.3, 0.16.4, 0.15.2, and 0.14.2.

Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.

CVE-2018-1000842 has a CVSS score of 6.1 (Medium). The vector is network-reachable, no privileges required, and user interaction required. 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 (0.14.2, 0.15.2, 0.16.4, 0.17.3, 0.18.1); upgrading removes the vulnerable code path.

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1. What is CVE-2018-1000842? CVE-2018-1000842 is a medium-severity cross-site scripting (XSS) vulnerability in fat_free_crm (rubygems), affecting versions < 0.14.2. It is fixed in 0.14.2, 0.15.2, 0.16.4, 0.17.3, 0.18.1. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
2. How severe is CVE-2018-1000842? CVE-2018-1000842 has a CVSS score of 6.1 (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.
3. Which versions of fat_free_crm are affected by CVE-2018-1000842? fat_free_crm (rubygems) versions < 0.14.2 is affected.
4. Is there a fix for CVE-2018-1000842? Yes. CVE-2018-1000842 is fixed in 0.14.2, 0.15.2, 0.16.4, 0.17.3, 0.18.1. Upgrade to this version or later.
5. Is CVE-2018-1000842 exploitable, and should I be worried? Whether CVE-2018-1000842 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
6. What actually determines whether CVE-2018-1000842 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.
7. How do I fix CVE-2018-1000842?
   • Upgrade fat_free_crm to 0.14.2 or later
   • Upgrade fat_free_crm to 0.15.2 or later
   • Upgrade fat_free_crm to 0.16.4 or later
   • Upgrade fat_free_crm to 0.17.3 or later
   • Upgrade fat_free_crm to 0.18.1 or later

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