Strategic Overview
- Status
- Patched in 2.4.7
- Affected Plugin
- Easy Custom Auto Excerpt
- Affected Version
< 2.4.7- CVSS
- 5.4Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2018-5311
At a glance
CVE-2018-5311 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Easy Custom Auto Excerpt WordPress plugin, affecting versions < 2.4.7. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). The issue is fixed in version 2.4.7; sites on affected versions should update now. Disclosed November 2018, reported by d4wner.
Vulnerability Overview
The Easy Custom Auto Excerpt plugin 2.4.6 for WordPress has XSS via the tonjoo_ecae_options[custom_css] parameter to the wp-admin/admin.php?page=tonjoo_excerpt URI.
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 Easy Custom Auto Excerpt < 2.4.7 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 Easy Custom Auto Excerpt the fix is 2.4.7: builds < 2.4.7 are affected, anything from 2.4.7 onward is not.
Remediation
Update to version 2.4.7, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to Easy Custom Auto Excerpt: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Easy Custom Auto Excerpt 2.4.7 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Other vulnerabilities in Easy Custom Auto Excerpt
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