CVE-2026-54833

Enable CORS <= 2.0.3 - Backdoor

2026-06-18 00:00

Strategic Overview

Status: Patched in 2.0.4
Affected Plugin: Enable CORS
Affected Version: <= 2.0.3
CVSS: 9.8Critical
Weakness type: CWE-506 · Embedded Malicious Code
CVE: CVE-2026-54833

At a glance

CVE-2026-54833 is a critical-severity Embedded Malicious Code vulnerability in the Enable CORS WordPress plugin, affecting versions <= 2.0.3. It carries a CVSS score of 9.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 2.0.4; sites on affected versions should update now. Disclosed June 2026, reported by Ananda Dhakal.

Vulnerability Overview

The Enable CORS plugin contained a backdoor in all versions up to, and including, 2.0.3. This makes it possible for unauthenticated attackers to gain privileged access to a site.

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. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-506: Embedded Malicious Code

Reaching this weakness in Enable CORS <= 2.0.3 takes a caller who can reach the endpoint. Embedded malicious code means functionality was deliberately placed in the software to act against the site owner's interest, rather than being an accidental defect.

Removing the software is not enough on its own — anything it created or modified while active has to be audited too. For Enable CORS the fix is 2.0.4: builds <= 2.0.3 are affected, anything from 2.0.4 onward is not.

Remediation

Update to version 2.0.4, or a newer patched version

How does WordSec protect against this?

Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: Enable CORS 2.0.4 closes this, and updating the plugin is the step that ends it.

Scanner
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-54833 https://www.wordfence.com/threat-intel/vulnerabilities/id/2a3e8c29-2e97-48f0-bf72-303857b51511 https://nvd.nist.gov/vuln/detail/CVE-2026-54833

CVSS Vector

9.8

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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