Uppercase < 1.2.2 - Unauthenticated Local File Inclusion
Strategic Overview
- Status
- Patched in 1.2.2
- Affected Theme
- Uppercase - WordPress Blog Theme with Dark Mode
- Affected Version
< 1.2.2- CVSS
- 8.1High
- Weakness type
- CWE-98 · Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')
- CVE
CVE-2026-39559
At a glance
CVE-2026-39559 is a high-severity Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in the Uppercase - WordPress Blog Theme with Dark Mode WordPress theme, affecting versions < 1.2.2. It carries a CVSS score of 8.1 (reachable over the network; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 1.2.2; sites on affected versions should update now. Disclosed April 2026, reported by João Pedro Soares de Alcântara.
Vulnerability Overview
The Uppercase theme for WordPress is vulnerable to Local File Inclusion in versions up to 1.2.2. This makes it possible for unauthenticated attackers to include and execute arbitrary files on the server, allowing the execution of any PHP code in those files. This can be used to bypass access controls, obtain sensitive data, or achieve code execution in cases where images and other "safe" file types can be uploaded and included.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, 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-98: Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')
Uppercase - WordPress Blog Theme with Dark Mode < 1.2.2 carries this weakness at safe, and reaching it takes no account at all. PHP file inclusion means a path used by include or require is built from request data, so the file that gets executed is under the caller's influence.
Including an attacker-influenced file executes its contents, which is why this class is routinely chained with an upload or log-poisoning step to reach code execution. For Uppercase - WordPress Blog Theme with Dark Mode the fix is 1.2.2: builds < 1.2.2 are affected, anything from 1.2.2 onward is not.
Remediation
Update to version 1.2.2, or a newer patched version
How does WordSec protect against this?
Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. 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: Uppercase - WordPress Blog Theme with Dark Mode 1.2.2 closes this, and updating the theme is the step that ends it.
- Firewall
- Scanner
- Login Security
External References
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