CVE-2021-27917: Prior to this patch, a stored XSS vulnerability existed in the contact tracking and page hits report.

Routine

HIGH 7.3REMOTEUPGRADE

CVE-2021-27917 is a high-severity flaw (CVSS 7.3) affecting mautic. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Prior to this patch, a stored XSS vulnerability existed in the contact tracking and page hits report.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-09-18
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

2024-09-18 22:15 UTCPublished CVE record published
2026-06-17 03:45 UTCUpdated Record last modified

acquia mautic UPGRADE

Affected: > 1.0.0 and < 4.4.13 · >= 5.0.0 and < 5.1.1 · 1.0.0 · 1.0.0 beta4 · 1.0.0 rc1 · 1.0.0 rc2 · 1.0.0 rc3 · 1.0.0 rc4

Fixed in: 4.4.13, 5.1.1

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 4.4.13 (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-2021-27917?

mautic: upgrade to 4.4.13, 5.1.1. Exact commands for each OS are on this page.

Is CVE-2021-27917 being exploited?

CVE-2021-27917 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-2021-27917 affect?

CVE-2021-27917 affects mautic. Severity is high (CVSS 7.3). Prior to this patch, a stored XSS vulnerability existed in the contact tracking and page hits report.

How urgent is CVE-2021-27917?

Priority 36/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

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CVE-2024-47055 MEDIUM 4.3 UPGRADE SummaryThis advisory addresses a security vulnerability in Mautic related to the segment cloning functionality
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References

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