CVE-2018-12290: The Yii2-StateMachine extension v2.x.x for Yii2 has XSS.

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MEDIUM 6.1DOWNGRADE

CVE-2018-12290 is a medium-severity flaw (CVSS 6.1) affecting yii2-statemachine. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Yii2-StateMachine extension v2.x.x for Yii2 has 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	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-06-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: yii2-statemachine

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

Am I affected?

Timeline

2018-06-13 14:29 UTCPublished CVE record published
2026-06-17 01:37 UTCUpdated Record last modified

yii2-statemachine yii2-statemachine DOWNGRADE

Affected: 2.x.x

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.x.x

1. Check installed version

apt-cache policy yii2-statemachine || rpm -q yii2-statemachine || yii2-statemachine --version

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

apt-cache madison yii2-statemachine sudo apt install yii2-statemachine=<VERSION_BEFORE_2.x.x> sudo apt-mark hold yii2-statemachine

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

dnf --showduplicates list yii2-statemachine sudo dnf downgrade yii2-statemachine-<VERSION_BEFORE_2.x.x> sudo dnf versionlock add yii2-statemachine

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-2018-12290?

yii2-statemachine: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-12290 being exploited?

CVE-2018-12290 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-2018-12290 affect?

CVE-2018-12290 affects yii2-statemachine. Severity is medium (CVSS 6.1). The Yii2-StateMachine extension v2.x.x for Yii2 has XSS.

How urgent is CVE-2018-12290?

Priority 40/100. Public exploit reference

References

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