XSS in Yoast Seo
CVE-2021-24153
A Stored Cross-Site Scripting vulnerability was discovered in the Yoast SEO WordPress plugin before 3.4.1, which had built-in blacklist filters which were blacklisting Parenthesis as well as several functions such as alert but bypasses were found.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.011 (64.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Yoast Seo
- Yoast Seo — versions 3.4.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- wpscan.com/vulnerability/77810044-394d-4314-b9a1-20c7dca726dc (Third Party Advisory)
- plugins.trac.wordpress.org/changeset/1466243/wordpress-seo (Third Party Advisory)
- packetstormsecurity.com/files/138192/ (Exploit, VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-24153?
- CVE-2021-24153 is a medium-severity vulnerability in Yoast Seo, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-04-05.
- How severe is CVE-2021-24153?
- Medium severity. CVSS v3 base score is 5.4 out of 10.
- Is CVE-2021-24153 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.