CVE-2020-23517: Cross Site Scripting (XSS) vulnerability in Aryanic HighMail (High CMS) versions 2020 and before allows remote

Q: How do I fix CVE-2020-23517?

high cms: upgrade to newer than 2020. Exact commands for each OS are on this page.

Q: Is CVE-2020-23517 being exploited?

CVE-2020-23517 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-2020-23517 affect?

CVE-2020-23517 affects high cms. Severity is medium (CVSS 6.1). Cross Site Scripting (XSS) vulnerability in Aryanic HighMail (High CMS) versions 2020 and before allows remote attackers to inject arbitrary web script or HTML, via 'user' to LoginForm.

Q: How urgent is CVE-2020-23517?

Priority 50/100. EPSS top 6%: very likely to be exploited; Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2020-23517 is a medium-severity flaw (CVSS 6.1) affecting high cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting (XSS) vulnerability in Aryanic HighMail (High CMS) versions 2020 and before allows remote attackers to inject arbitrary web script or HTML, via 'user' to LoginForm.

Why this priority

EPSS top 6%: very likely to be exploited
Public exploit reference

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	7.3% (top 6%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-03-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: aryanic

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

Am I affected?

Timeline

2021-03-26 03:16 UTCPublished CVE record published
2026-06-17 03:04 UTCUpdated Record last modified

aryanic high cms UPGRADE

Affected: <= 2020

Fixed in: newer than 2020

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy high-cms || rpm -q high-cms || high-cms --version

2. UPGRADE to newer than 2020 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade high-cms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade high-cms

Note

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

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: Aryanic HighMail (High CMS) - Cross-Site Scripting

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-2020-23517?

high cms: upgrade to newer than 2020. Exact commands for each OS are on this page.

Is CVE-2020-23517 being exploited?

CVE-2020-23517 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-2020-23517 affect?

CVE-2020-23517 affects high cms. Severity is medium (CVSS 6.1). Cross Site Scripting (XSS) vulnerability in Aryanic HighMail (High CMS) versions 2020 and before allows remote attackers to inject arbitrary web script or HTML, via 'user' to LoginForm.

How urgent is CVE-2020-23517?

Priority 50/100. EPSS top 6%: very likely to be exploited; Public exploit reference

References

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