CVE-2021-36788

FAUCET Score

CVE-2021-36788 describes a Cross-Site Scripting (XSS) vulnerability in the Yoast SEO extension for TYPO3, affecting versions prior to 7.2.3. This medium-severity vulnerability (CVSS 5.4) requires low privileges and user interaction, allowing an attacker to inject malicious scripts, potentially leading to information disclosure or limited integrity impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 7.2.3CPE matchmatch criteria	cpe:2.3:a:yoast:yoast_seo::::::typo3::*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

Exploitability Score

2.3

Impact Score

2.7

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.47%

Probability of exploitation in next 30 days

EPSS Percentile

38.1%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0047 is in the 57th percentile among its peer group of 15,224 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

composerpatch availablevia ghsa

Product: yoast-seo-for-typo3/yoast_seoFixed in: 7.2.3

Vendor Advisories (1)

composerGHSA-28w5-j8xj-2xwcmedium

Cross-site Scripting in the yoast_seo TYPO3 extension

Sep 1, 2021

References

typo3.org / help/security-advisories/security

Vendor Advisory

typo3.org / security/advisory/typo3-ext-sa-2021-013

Vendor Advisory