CVE-2020-21088: Cross Site Scripting (XSS) in X2engine X2CRM v7.1 and older allows remote attackers to obtain sensitive inform

Q: How do I fix CVE-2020-21088?

x2crm: upgrade to newer than 7.1. Exact commands for each OS are on this page.

Q: Is CVE-2020-21088 being exploited?

CVE-2020-21088 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-21088 affect?

CVE-2020-21088 affects x2crm. Severity is medium (CVSS 4.8). Cross Site Scripting (XSS) in X2engine X2CRM v7.1 and older allows remote attackers to obtain sensitive information by injecting arbitrary web script or HTML via the "First Name" and "Last Name" fields in "/index.php/contacts/create page"

Q: How urgent is CVE-2020-21088?

Priority 36/100. Public exploit reference

Routine

MEDIUM 4.8UPGRADE

CVE-2020-21088 is a medium-severity flaw (CVSS 4.8) 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 and older allows remote attackers to obtain sensitive information by injecting arbitrary web script or HTML via the "First Name" and "Last Name" fields in "/index.php/contacts/create page"

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.8% (top 45%)
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 03:03 UTCUpdated Record last modified

x2engine x2crm UPGRADE

Affected: <= 7.1

Fixed in: newer than 7.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 7.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade x2crm

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade x2crm

Note

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

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-2020-21088?

x2crm: upgrade to newer than 7.1. Exact commands for each OS are on this page.

Is CVE-2020-21088 being exploited?

CVE-2020-21088 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-2020-21088 affect?

CVE-2020-21088 affects x2crm. Severity is medium (CVSS 4.8). Cross Site Scripting (XSS) in X2engine X2CRM v7.1 and older allows remote attackers to obtain sensitive information by injecting arbitrary web script or HTML via the "First Name" and "Last Name" fields in "/index.php/contacts/create page"

How urgent is CVE-2020-21088?

Priority 36/100. Public exploit reference

Software pages

PHP vulnerabilities

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References

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