How severe is CVE-2021-27909?

CVE-2021-27909 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2021-27909 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27909?

CVE-2021-27909 primarily affects Acquia Mautic. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-27909?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-27909 published?

CVE-2021-27909 was published on 2021-08-30 and last updated on 2026-06-17.

CVE-2021-27909

CVE-2021-27909 is a medium-severity vulnerability in Acquia Mautic with a CVSS 3.x base score of 6.3. 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: Medium (CVSS 3.x base score 6.3)
CVSS v2: 4.3
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Acquia Mautic
Published: 2021-08-30
Last modified: 2026-06-17

Description

For Mautic versions prior to 3.3.4/4.0.0, there is an XSS vulnerability on Mautic's password reset page where a vulnerable parameter, "bundle," in the URL could allow an attacker to execute Javascript code. The attacker would be required to convince or trick the target into clicking a password reset URL with the vulnerable parameter utilized.

Frequently asked questions

What is CVE-2021-27909?: For Mautic versions prior to 3.3.4/4.0.0, there is an XSS vulnerability on Mautic's password reset page where a vulnerable parameter, "bundle," in the URL could allow an attacker to execute Javascript code. The attacker would be required to convince or trick the target into clicking a password reset URL with the vulnerable parameter utilized.
How severe is CVE-2021-27909?: CVE-2021-27909 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2021-27909 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27909?: CVE-2021-27909 primarily affects Acquia Mautic. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-27909?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27909 published?: CVE-2021-27909 was published on 2021-08-30 and last updated on 2026-06-17.

References

https://github.com/mautic/mautic/security/advisories/GHSA-32hw-3pvh-vcvc

Affected products (4)

cpe:2.3:a:acquia:mautic:*:*:*:*:*:*:*:*
cpe:2.3:a:acquia:mautic:4.0.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:acquia:mautic:4.0.0:beta:*:*:*:*:*:*
cpe:2.3:a:acquia:mautic:4.0.0:rc:*:*:*:*:*:*

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