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Cross-site Scripting in the yoast_seo TYPO3 extension

Moderate severity GitHub Reviewed Published Sep 1, 2021 to the GitHub Advisory Database • Updated Feb 1, 2023

Package

composer yoast-seo-for-typo3/yoast_seo (Composer)

Affected versions

< 7.2.3

Patched versions

7.2.3

Description

The extension fails to properly encode user input for output in HTML context. A TYPO3 backend user account is required to exploit the vulnerability.

References

Published by the National Vulnerability Database Aug 13, 2021
Reviewed Aug 30, 2021
Published to the GitHub Advisory Database Sep 1, 2021
Last updated Feb 1, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.054%
(25th percentile)

Weaknesses

CVE ID

CVE-2021-36788

GHSA ID

GHSA-28w5-j8xj-2xwc

Source code

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