CVE-2020-35125 is a critical-severity cross-site scripting (XSS) vulnerability in mautic/core (composer), affecting versions < 2.16.5. It is fixed in 2.16.5, 3.2.4.
Impact This is a cross-site scripting vulnerability which affects every version of Mautic and could allow an attacker unauthorised administrator level access to Mautic. This vulnerability was reported by Naveen Sunkavally at Horizon3.ai. Patches Upgrade to 3.2.4 or 2.16.5. Link to patch for 2.x versions: https://github.com/mautic/mautic/compare/2.16.4...2.16.5.diff Link to patch for 3.x versions: https://github.com/mautic/mautic/compare/3.2.2...3.2.4.diff Workarounds None For more information If you have any questions or comments about this advisory: Post in https://forum.mautic.org/c/support Email us at [email protected]
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-2020-35125 has a CVSS score of 9.6 (Critical). 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 (2.16.5, 3.2.4). Upgrading removes the vulnerable code path.
composer
mautic/core (< 2.16.5)mautic/core (>= 3.0.0, < 3.2.4)mautic/core → 2.16.5 (composer)mautic/core → 3.2.4 (composer)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.
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Already deployed Kodem? See CVE-2020-35125 in your environment →Upgrade the following packages to resolve this vulnerability:
mautic/core to 2.16.5 or latermautic/core to 3.2.4 or laterKodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2020-35125 is a critical-severity cross-site scripting (XSS) vulnerability in mautic/core (composer), affecting versions < 2.16.5. It is fixed in 2.16.5, 3.2.4. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
CVE-2020-35125 has a CVSS score of 9.6 (Critical). 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.
mautic/core (composer) versions < 2.16.5 is affected.
Yes. CVE-2020-35125 is fixed in 2.16.5, 3.2.4. Upgrade to this version or later.
Whether CVE-2020-35125 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.
mautic/core to 2.16.5 or latermautic/core to 3.2.4 or later