CVE-2021-27288: Cross Site Scripting (XSS) in X2Engine X2CRM v7.1 allows remote attackers to obtain sensitive information by i

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MEDIUM 6.1DOWNGRADE

CVE-2021-27288 is a medium-severity flaw (CVSS 6.1) affecting x2crm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting (XSS) in X2Engine X2CRM v7.1 allows remote attackers to obtain sensitive information by injecting arbitrary web script or HTML via the "Comment" field in "/profile/activity" page.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-04-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: x2engine

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

Am I affected?

Timeline

2021-04-14 14:15 UTCPublished CVE record published
2026-06-17 03:44 UTCUpdated Record last modified

x2engine x2crm DOWNGRADE

Affected: 7.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.1

1. Check installed version

apt-cache policy x2crm || rpm -q x2crm || x2crm --version

2. No fixed release: DOWNGRADE to a release before 7.1 (Debian / Ubuntu)

apt-cache madison x2crm sudo apt install x2crm=<VERSION_BEFORE_7.1> sudo apt-mark hold x2crm

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list x2crm sudo dnf downgrade x2crm-<VERSION_BEFORE_7.1> sudo dnf versionlock add x2crm

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-2021-27288?

x2crm: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-27288 being exploited?

CVE-2021-27288 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-2021-27288 affect?

CVE-2021-27288 affects x2crm. Severity is medium (CVSS 6.1). Cross Site Scripting (XSS) in X2Engine X2CRM v7.1 allows remote attackers to obtain sensitive information by injecting arbitrary web script or HTML via the "Comment" field in "/profile/activity" page.

How urgent is CVE-2021-27288?

Priority 41/100. Public exploit reference

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CVE-2021-33853 MEDIUM 5.4 DOWNGRADE A Cross-Site Scripting (XSS) attack can cause arbitrary code (javascript) to run in a user’s browser while the
CVE-2020-21088 MEDIUM 4.8 UPGRADE Cross Site Scripting (XSS) in X2engine X2CRM v7.1 and older allows remote attackers to obtain sensitive inform

References

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