CVE-2018-6389
HighPublic exploitIn WordPress through 4.9.2, unauthenticated attackers can cause a denial of service (resource consumption) by using the large list of registered .js files (from wp-includes/script-loader.php) to construct a series of requests to load every file many times.
Published Feb 6, 2018 · Updated Aug 4, 2026 · Also known as 1d5987cd-1304-487c-8d1c-cab0510fbb84, DEBIAN-CVE-2018-6389, UBUNTU-CVE-2018-6389
Key Facts
Patch immediately- CVE-2018-6389 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Wordpress.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 73% probability of exploitation in the next 30 days.
- Fixed versions are available, including Wordpress 5.0, Wordpress <=4.9.2, Wordpress 4.9.2.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
7.5
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
73%
Higher than 99.4% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
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Description
In WordPress through 4.9.2, unauthenticated attackers can cause a denial of service (resource consumption) by using the large list of registered .js files (from wp-includes/script-loader.php) to construct a series of requests to load every file many times.
Affected Products
20 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| WordpressWordpress | See advisory | 4.9.2 |
Patched Releases
Wordpress
5.0, <=4.9.2
Timeline
Publicly disclosed
Feb 6, 2018
Last updated
Aug 4, 2026
Weakness Type
- CWE-400 Uncontrolled Resource Consumption
References
- advisoryhttps://github.com/WazeHell/CVE-2018-6389
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2018-6389
- advisoryhttps://ubuntu.com/security/CVE-2018-6389
- advisoryhttps://wpvulndb.com/vulnerabilities/9021
- advisoryhttps://www.cve.org/CVERecord?id=CVE-2018-6389
FAQ
Common Questions.
In WordPress through 4.9.2, unauthenticated attackers can cause a denial of service (resource consumption) by using the large list of registered .js files (from wp-includes/script-loader.php) to construct a series of requests to load every file many times.
Affected: Wordpress. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Wordpress 5.0, Wordpress <=4.9.2, Wordpress 4.9.2.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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