CVE-2020-22453: Untis WebUntis before 2020.9.6 allows XSS in multiple functions that store information.

Q: How do I fix CVE-2020-22453?

webuntis: upgrade to 2020.9.6. Exact commands for each OS are on this page.

Q: Is CVE-2020-22453 being exploited?

CVE-2020-22453 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-2020-22453 affect?

CVE-2020-22453 affects webuntis. Severity is medium (CVSS 6.1). Untis WebUntis before 2020.9.6 allows XSS in multiple functions that store information.

Q: How urgent is CVE-2020-22453?

Priority 34/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2020-22453 is a medium-severity flaw (CVSS 6.1) affecting webuntis. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Untis WebUntis before 2020.9.6 allows XSS in multiple functions that store information.

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 49%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-09-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: untis

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

Am I affected?

Timeline

2020-09-24 14:15 UTCPublished CVE record published
2026-06-17 03:04 UTCUpdated Record last modified

untis webuntis UPGRADE

Affected: < 2020.9.6

Fixed in: 2020.9.6

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2020.9.6 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webuntis

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-2020-22453?

webuntis: upgrade to 2020.9.6. Exact commands for each OS are on this page.

Is CVE-2020-22453 being exploited?

CVE-2020-22453 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-2020-22453 affect?

CVE-2020-22453 affects webuntis. Severity is medium (CVSS 6.1). Untis WebUntis before 2020.9.6 allows XSS in multiple functions that store information.

How urgent is CVE-2020-22453?

Priority 34/100. No elevated risk signals yet.

Related CVEs

CVE-2020-10540 HIGH 8.8 UPGRADE Untis WebUntis before 2020.9.6 allows CSRF for certain combinations of rights and modules.

References

← Back to latest CVEs