---
title: "CVE-2020-35125: Mautic is vulnerable to XSS vulnerability"
url: https://erroneo.us/security/cve/CVE-2020-35125/
description: "CVE-2020-35125 (mautic/core (Composer (PHP))): A cross-site scripting (XSS) vulnerability in the forms component of Mautic before 3.2.4 allows remote…"
type: vulnerability-record
section: "Security Digest"
date_published: 2021-02-09
date_modified: 2024-08-04
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2020-35125"
kev: false
cvss: 9.6
epss: 0.02694
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2020-35125: Mautic is vulnerable to XSS vulnerability

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 2.7% , percentile 86: FIRST’s model estimates a 2.7% chance of exploitation activity in the next 30 days, higher than 86% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.
- Only applies if your dependency tree includes mautic/core (Composer (PHP)) < 2.16.5, fixed in 2.16.5 ; mautic/core (Composer (PHP)) >= 3.0.0, < 3.2.4, fixed in 3.2.4 . Check your lockfile, including transitive dependencies.

## What it is

A cross-site scripting (XSS) vulnerability in the forms component of Mautic before 3.2.4 allows remote attackers to inject executable JavaScript via mautic[return] (a different attack method than CVE-2020-35124, but also related to the Referer concept).

## Affected packages

- Composer (PHP) `mautic/core` < 2.16.5 → fixed: 2.16.5
- Composer (PHP) `mautic/core` >= 3.0.0, < 3.2.4 → fixed: 3.2.4

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- GitHub CVSS 3.1: 9.6 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- FIRST EPSS (model of 2026-10-21): 2.69% probability of exploitation activity in the next 30 days; percentile 86.

## Sources

- [GitHub Advisory GHSA-42q7-95j7-w62m](https://github.com/advisories/GHSA-42q7-95j7-w62m)
- [CVE.org record CVE-2020-35125](https://www.cve.org/CVERecord?id=CVE-2020-35125)
- [NVD entry CVE-2020-35125](https://nvd.nist.gov/vuln/detail/CVE-2020-35125)
- [forum.mautic.org](https://forum.mautic.org/c/announcements/16)
- [mautic.org](https://www.mautic.org/blog/community/security-release-all-versions-mautic-prior-2-16-5-and-3-2-4)
- [horizon3.ai](https://www.horizon3.ai/disclosures/mautic-unauth-xss-to-rce)
- [github.com](https://github.com/mautic/mautic/security/advisories/GHSA-42q7-95j7-w62m)
- [github.com](https://github.com/FriendsOfPHP/security-advisories/blob/master/mautic/core/CVE-2020-35125.yaml)
- [packagist.org](https://packagist.org/packages/mautic/core)

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Source page: https://erroneo.us/security/cve/CVE-2020-35125/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt