How severe is CVE-2020-35128?

CVE-2020-35128 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-35128 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35128?

CVE-2020-35128 affects Acquia Mautic. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35128?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-35128 published?

CVE-2020-35128 was published on 2021-01-19 and last updated on 2026-06-17.

CVE-2020-35128

CVE-2020-35128 is a critical-severity vulnerability in Acquia Mautic with a CVSS 3.x base score of 9.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Critical (CVSS 3.x base score 9.0)
CVSS v2: 6.0
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Acquia Mautic
Published: 2021-01-19
Last modified: 2026-06-17

Description

Mautic before 3.2.4 is affected by stored XSS. An attacker with permission to manage companies, an application feature, could attack other users, including administrators. For example, by loading an externally crafted JavaScript file, an attacker could eventually perform actions as the target user. These actions include changing the user passwords, altering user or email addresses, or adding a new administrator to the system.

Frequently asked questions

What is CVE-2020-35128?: Mautic before 3.2.4 is affected by stored XSS. An attacker with permission to manage companies, an application feature, could attack other users, including administrators. For example, by loading an externally crafted JavaScript file, an attacker could eventually perform actions as the target user. These actions include changing the user passwords, altering user or email addresses, or adding a new administrator to the system.
How severe is CVE-2020-35128?: CVE-2020-35128 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-35128 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35128?: CVE-2020-35128 affects Acquia Mautic. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35128?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-35128 published?: CVE-2020-35128 was published on 2021-01-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:acquia:mautic:*:*:*:*:*:*:*:*

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