What is CVE-2018-6009?

CVE-2018-6009 is a high-severity vulnerability in Yiiframework, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2018-01-22.

How severe is CVE-2018-6009?

High severity. CVSS v3 base score is 8.8 out of 10.

CSRF in Yiiframework

CVE-2018-6009

In Yii Framework 2.x before 2.0.14, the switchIdentity function in web/User.php did not regenerate the CSRF token upon a change of identity.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2018-01-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

Yiiframework — versions 2.0.0, 2.0.1, 2.0.2

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

github.com/yiisoft/yii2/commit/6c0540aa2d6e0fe0fa89e4fd35bba4be5d6cece7 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-6009?: CVE-2018-6009 is a high-severity vulnerability in Yiiframework, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2018-01-22.
How severe is CVE-2018-6009?: High severity. CVSS v3 base score is 8.8 out of 10.