CVE-2021-40289: mm-wki v0.2.1 is vulnerable to Cross Site Scripting (XSS).

Routine

MEDIUM 6.1DOWNGRADE

CVE-2021-40289 is a medium-severity flaw (CVSS 6.1) affecting mm-wki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

mm-wki v0.2.1 is vulnerable to Cross Site Scripting (XSS).

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-11-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mm-wki project

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

Am I affected?

Timeline

2022-11-10 18:15 UTCPublished CVE record published
2026-06-17 04:06 UTCUpdated Record last modified

mm-wki project mm-wki DOWNGRADE

Affected: 0.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.2.1

1. Check installed version

apt-cache policy mm-wki || rpm -q mm-wki || mm-wki --version

2. No fixed release: DOWNGRADE to a release before 0.2.1 (Debian / Ubuntu)

apt-cache madison mm-wki sudo apt install mm-wki=<VERSION_BEFORE_0.2.1> sudo apt-mark hold mm-wki

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

dnf --showduplicates list mm-wki sudo dnf downgrade mm-wki-<VERSION_BEFORE_0.2.1> sudo dnf versionlock add mm-wki

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-2021-40289?

mm-wki: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-40289 being exploited?

CVE-2021-40289 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-2021-40289 affect?

CVE-2021-40289 affects mm-wki. Severity is medium (CVSS 6.1). mm-wki v0.2.1 is vulnerable to Cross Site Scripting (XSS).

How urgent is CVE-2021-40289?

Priority 37/100. Public exploit reference

References

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