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Craft CMS XSS in RSS widget feed

Moderate severity GitHub Reviewed Published May 25, 2023 in craftcms/cms • Updated Nov 7, 2023

Package

composer craftcms/cms (Composer)

Affected versions

>= 4.3.0, <= 4.4.5

Patched versions

4.4.6

Description

Summary

A malformed RSS feed can deliver an XSS payload

PoC

Create an RSS widget and add the domain https://blog.whitebear.vn/file/rss-xss2.rss
The XSS payload will be triggered by the title in tag <item>

Resolved in craftcms/cms@b77cb30

References

@angrybrad angrybrad published to craftcms/cms May 25, 2023
Published to the GitHub Advisory Database May 26, 2023
Reviewed May 26, 2023
Published by the National Vulnerability Database May 27, 2023
Last updated Nov 7, 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
None
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:N/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.086%
(38th percentile)

Weaknesses

CVE ID

CVE-2023-33195

GHSA ID

GHSA-qpgm-gjgf-8c2x

Source code

Credits

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