WordPress Slider Block Gutenslider <= 5.1.5 - Cross-Site Scripting
Strategic Overview
- Status
- Patched in 5.2.0
- Affected Plugin
- WordPress Slider Block Gutenslider
- Affected Version
< 5.2.0- CVSS
- 5.4Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2021-24640
At a glance
CVE-2021-24640 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the WordPress Slider Block Gutenslider WordPress plugin, affecting versions < 5.2.0. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). The issue is fixed in version 5.2.0; sites on affected versions should update now. Disclosed August 2021, reported by apple502j.
Vulnerability Overview
The WordPress Slider Block Gutenslider plugin before 5.2.0 does not escape the minWidth attribute of a Gutenburg block, which could allow users with a role as low as contributor to perform Cross-Site Scripting attacks
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Reaching this weakness in WordPress Slider Block Gutenslider < 5.2.0 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 WordPress Slider Block Gutenslider the fix is 5.2.0: builds < 5.2.0 are affected, anything from 5.2.0 onward is not.
Remediation
Update to version 5.2.0, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to WordPress Slider Block Gutenslider: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: WordPress Slider Block Gutenslider 5.2.0 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in WordPress Slider Block Gutenslider
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