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XSS through the width parameter

Critical
ChiuchiuSorin published GHSA-84wx-6vfp-5m6g Nov 13, 2024

Package

maven com.xwiki.pdfviewer:macro-pdfviewer (Maven)

Affected versions

<= 2.5.5

Patched versions

2.5.6

Description

Impact

The width parameter of the PDF viewer macro isn't properly escaped, allowing XSS for any user who can edit a page. To reproduce, just set the width parameter to 100%"></iframe><script>alert(1)</script> - if an alert is shown after saving the page, the macro is vulnerable. XSS can impact the confidentiality, integrity and availability of the whole XWiki installation when an admin visits the page with the malicious code.

Patches

Fixed in version 2.5.6

Severity

Critical

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
High
Integrity
High
Availability
High

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:H/I:H/A:H

CVE ID

CVE-2024-52300

Weaknesses