CVE-2021-36788
Cross-site Scripting in the yoast_seo TYPO3 extension
The yoast_seo (aka Yoast SEO) extension before 7.2.3 for TYPO3 allows XSS.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
The yoast_seo (aka Yoast SEO) extension before 7.2.3 for TYPO3 allows XSS.
- Record
CVE-2021-36788- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 3.5 Low
AV:N/AC:M/Au:S/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
The yoast_seo (aka Yoast SEO) extension before 7.2.3 for TYPO3 allows XSS.
- Record
CVE-2021-36788- Updated
- 2026-11-02
EUVDEUVD-2021-1947 No score
The yoast_seo (aka Yoast SEO) extension before 7.2.3 for TYPO3 allows XSS.
- Record
EUVD-2021-1947- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-28w5-j8xj-2xwc
Cross-site Scripting in the yoast_seo TYPO3 extension
The extension fails to properly encode user input for output in HTML context. A TYPO3 backend user account is required to exploit the vulnerability.
- Record
GHSA-28w5-j8xj-2xwc- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVGHSA-28w5-j8xj-2xwc
Cross-site Scripting in the yoast_seo TYPO3 extension
The extension fails to properly encode user input for output in HTML context. A TYPO3 backend user account is required to exploit the vulnerability.
- Record
GHSA-28w5-j8xj-2xwc- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
yoast-seo-for-typo3/yoast_seoPackagist |
before 7.2.3 | 7.2.3 |
yoast-seo-for-typo3/yoast_seoPackagist |
before 7.2.3, plus listed versions 7.1.07.1.17.1.27.1.37.2.0 Show 42 moreShow less7.2.17.2.2v1.0v1.0-betav1.0-rcv1.0.1v1.1.0v1.1.1v1.1.2v1.2.0v1.2.1v1.2.2v1.2.3v1.3.0v1.4.0v1.4.1v2.0.0v2.0.1v2.0.2v2.1.0v3.0.0v3.0.1v3.0.2v3.0.3v3.0.4v3.0.5v4.0.0v4.1.0v5.0.0v5.0.1v5.1.0v5.1.1v6.0.0v6.0.1v7.0.0v7.0.1v7.0.2v7.0.3v7.0.4v7.0.5v7.0.6v7.0.7 |
7.2.3 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-36788 is a medium vulnerability (CVSS 5.4) in Yoast Seo, published August 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.47%, the 40th percentile. Fixed in yoast-seo-for-typo3/yoast_seo 7.2.3.
References
typo3.org/help/security-advisories/security
nvd.nist.gov/vuln/detail/CVE-2021-36788
github.com/Yoast/Yoast-SEO-for-TYPO3/commit/a8278dae97dce8cd0722d38f7f5a30b563668590