CVE-2023-28426

SVG Sanitizer library <= 0.15.4 - Cross-Site Scripting Bypass

2023-03-23 00:00

Strategic Overview

Status: Patched in 2.1.0
Affected Plugin: Safe SVG
Affected Version: <= 2.0.3
CVSS: 7.2High
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2023-28426

At a glance

CVE-2023-28426 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Safe SVG WordPress plugin, affecting versions <= 2.0.3. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 2.1.0; sites on affected versions should update now. Disclosed March 2023, reported by Cyxow.

Vulnerability Overview

The SVG Sanitizer library is vulnerable to XSS Bypass in versions up to, and including, 0.15.4. This may allow an attacker to successfully upload an SVG with persistent Cross-Site Scripting payloads in cases where a plugin is using this library to safely process SVG files.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in Safe SVG <= 2.0.3 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Safe SVG the fix is 2.1.0: builds <= 2.0.3 are affected, anything from 2.1.0 onward is not.

Remediation

Update to version 2.1.0, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Safe SVG: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Safe SVG 2.1.0 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2023-28426 https://www.wordfence.com/threat-intel/vulnerabilities/id/ca73de6d-2d47-4d7c-a917-0f99fed8c27d https://nvd.nist.gov/vuln/detail/CVE-2023-28426

Related records

Same weakness class

Other vulnerabilities in Safe SVG

CVSS Vector

7.2

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

This record contains material that is subject to copyright

CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

https://www.cve.org/Legal/TermsOfUse

Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.

https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/