CVE-2021-37365: CTparental before 4.45.03 is vulnerable to cross-site scripting (XSS) in the CTparental admin panel

Q: How do I fix CVE-2021-37365?

ctparental: upgrade to 4.45.03. Exact commands for each OS are on this page.

Q: Is CVE-2021-37365 being exploited?

CVE-2021-37365 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-2021-37365 affect?

CVE-2021-37365 affects ctparental. Severity is medium (CVSS 6.1). CTparental before 4.45.03 is vulnerable to cross-site scripting (XSS) in the CTparental admin panel. In bl_categires_help.php, the 'categories' variable is assigned with the content of the query string param 'cat' without sanitization or en

Q: How urgent is CVE-2021-37365?

Priority 34/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2021-37365 is a medium-severity flaw (CVSS 6.1) affecting ctparental. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CTparental before 4.45.03 is vulnerable to cross-site scripting (XSS) in the CTparental admin panel. In bl_categires_help.php, the 'categories' variable is assigned with the content of the query string param 'cat' without sanitization or encoding, enabling an attacker to inject malicious code into the output webpage.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-08-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ctparental project

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

Am I affected?

Timeline

2021-08-10 17:15 UTCPublished CVE record published
2026-06-17 04:00 UTCUpdated Record last modified

ctparental project ctparental UPGRADE

Affected: < 4.45.03

Fixed in: 4.45.03

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 4.45.03 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ctparental

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-2021-37365?

ctparental: upgrade to 4.45.03. Exact commands for each OS are on this page.

Is CVE-2021-37365 being exploited?

CVE-2021-37365 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-2021-37365 affect?

CVE-2021-37365 affects ctparental. Severity is medium (CVSS 6.1). CTparental before 4.45.03 is vulnerable to cross-site scripting (XSS) in the CTparental admin panel. In bl_categires_help.php, the 'categories' variable is assigned with the content of the query string param 'cat' without sanitization or en

How urgent is CVE-2021-37365?

Priority 34/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-37367 HIGH 7.8 UPGRADE CTparental before 4.45.07 is affected by a code execution vulnerability in the CTparental admin panel
CVE-2021-37366 HIGH 8.8 UPGRADE CTparental before 4.45.03 is vulnerable to cross-site request forgery (CSRF) in the CTparental admin panel

References

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