CVE-2023-28620: Auth

Q: How urgent is CVE-2023-28620?

Priority 28/100. No elevated risk signals yet.

Routine

MEDIUM 5.9DOWNGRADE

CVE-2023-28620 is a medium-severity flaw (CVSS 5.9) affecting cyberus key. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Auth. (admin+) Stored Cross-Site Scripting (XSS) vulnerability in Cyberus Labs Cyberus Key plugin <= 1.0 versions.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-06-13
Last modified	2026-06-17

Publisher (CNA): Patchstack · Vendor: cyberuslabs

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

Am I affected?

Timeline

2023-06-13 15:15 UTCPublished CVE record published
2026-06-17 05:48 UTCUpdated Record last modified

cyberuslabs cyberus key DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy cyberus-key || rpm -q cyberus-key || cyberus-key --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison cyberus-key sudo apt install cyberus-key=<VERSION_BEFORE_1.0> sudo apt-mark hold cyberus-key

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cyberus-key sudo dnf downgrade cyberus-key-<VERSION_BEFORE_1.0> sudo dnf versionlock add cyberus-key

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2023-28620?

cyberus key: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-28620 being exploited?

CVE-2023-28620 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-2023-28620 affect?

CVE-2023-28620 affects cyberus key. Severity is medium (CVSS 5.9). Auth. (admin+) Stored Cross-Site Scripting (XSS) vulnerability in Cyberus Labs Cyberus Key plugin <= 1.0 versions.

How urgent is CVE-2023-28620?

Priority 28/100. No elevated risk signals yet.

References

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