CVE-2021-27915: Prior to the patched version, there is an XSS vulnerability in the description fields within the Mautic applic

Routine

HIGH 7.6UPGRADE

CVE-2021-27915 is a high-severity flaw (CVSS 7.6) affecting mautic. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Prior to the patched version, there is an XSS vulnerability in the description fields within the Mautic application which could be exploited by a logged in user of Mautic with the appropriate permissions. This could lead to the user having elevated access to the system.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-80, CWE-79
Published	2024-09-17
Last modified	2026-06-17

Publisher (CNA): Mautic · Vendor: acquia

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-09-17 14:15 UTCPublished CVE record published
2026-06-17 03:45 UTCUpdated Record last modified

acquia mautic UPGRADE

Affected: >= 1.0.0 and < 4.4.12 · 1.0.0 · 1.0.0 beta2 · 1.0.0 beta3 · 1.0.0 beta4 · 1.0.0 rc1 · 1.0.0 rc2 · 1.0.0 rc3

Fixed in: 4.4.12

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy mautic || rpm -q mautic || mautic --version

2. UPGRADE to 4.4.12 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mautic

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mautic

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison mautic sudo apt install mautic=<VERSION_BEFORE_1.0.0> sudo apt-mark hold mautic

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mautic sudo dnf downgrade mautic-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add mautic

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-27915?

mautic: upgrade to 4.4.12. Exact commands for each OS are on this page.

Is CVE-2021-27915 being exploited?

CVE-2021-27915 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-27915 affect?

CVE-2021-27915 affects mautic. Severity is high (CVSS 7.6). Prior to the patched version, there is an XSS vulnerability in the description fields within the Mautic application which could be exploited by a logged in user of Mautic with the appropriate permissions. This could lead to the user having

How urgent is CVE-2021-27915?

Priority 39/100. High severity

Related CVEs

CVE-2026-3105 HIGH 7.6 UPGRADE SummaryThis advisory addresses a SQL injection vulnerability in the API endpoint used for retrieving contact a
CVE-2024-47059 MEDIUM 4.3 DOWNGRADE When logging in with the correct username and incorrect weak password, the user receives the notification, tha
CVE-2024-47058 LOW 2.9 UPGRADE With access to edit a Mautic form, the attacker can add Cross-Site Scripting stored in the html filed
CVE-2024-47055 MEDIUM 4.3 UPGRADE SummaryThis advisory addresses a security vulnerability in Mautic related to the segment cloning functionality
CVE-2024-47053 HIGH 7.7 UPGRADE This advisory addresses an authorization vulnerability in Mautic's HTTP Basic Authentication implementation

References

← Back to latest CVEs