CVE-2020-8789: Composr 10.0.30 allows Persistent XSS via a Usergroup name under the Security configuration.

Q: How do I fix CVE-2020-8789?

composr: upgrade to newer than 10.0.30. Exact commands for each OS are on this page.

Q: Is CVE-2020-8789 being exploited?

CVE-2020-8789 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-2020-8789 affect?

CVE-2020-8789 affects composr. Severity is medium (CVSS 5.4). Composr 10.0.30 allows Persistent XSS via a Usergroup name under the Security configuration.

Q: How urgent is CVE-2020-8789?

Priority 37/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2020-8789 is a medium-severity flaw (CVSS 5.4) affecting composr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Composr 10.0.30 allows Persistent XSS via a Usergroup name under the Security configuration.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-05-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: composr project

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

Am I affected?

Timeline

2020-05-22 14:15 UTCPublished CVE record published
2026-06-17 03:26 UTCUpdated Record last modified

composr project composr UPGRADE

Affected: <= 10.0.30

Fixed in: newer than 10.0.30

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 10.0.30 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade composr

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-2020-8789?

composr: upgrade to newer than 10.0.30. Exact commands for each OS are on this page.

Is CVE-2020-8789 being exploited?

CVE-2020-8789 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-2020-8789 affect?

CVE-2020-8789 affects composr. Severity is medium (CVSS 5.4). Composr 10.0.30 allows Persistent XSS via a Usergroup name under the Security configuration.

How urgent is CVE-2020-8789?

Priority 37/100. Public exploit reference

Related CVEs

CVE-2021-46360 HIGH 8.8 UPGRADE Authenticated remote code execution (RCE) in Composr-CMS 10.0.39 and earlier allows remote attackers to execut
CVE-2021-30150 MEDIUM 6.1 DOWNGRADE Composr 10.0.36 allows XSS in an XML script.
CVE-2021-30149 CRITICAL 9.8 DOWNGRADE Composr 10.0.36 allows upload and execution of PHP files.

References

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