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Uppercase Theme CVE-2026-39559

HIGH
PHP Remote File Inclusion (CWE-98)
2026-06-17 Patchstack
PHP Information Disclosure LFI Uppercase
8.1
CVSS 3.1 · Vendor: Patchstack
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Severity by source

Vendor (Patchstack) PRIMARY
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
6.5 MEDIUM

Network-reachable unauthenticated LFI (AV:N/PR:N/UI:N); AC:H because attacker must discover the vulnerable parameter; high confidentiality, limited integrity via log poisoning, no direct availability impact.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (Patchstack).

CVSS VectorVendor: Patchstack

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

1
Analysis Generated
Jun 17, 2026 - 14:35 vuln.today

DescriptionCVE.org

Unauthenticated Local File Inclusion in Uppercase < 1.2.2 versions.

AnalysisAI

Local File Inclusion in the CodeSupply Co. 'Uppercase' WordPress theme versions prior to 1.2.2 allows remote unauthenticated attackers to include and disclose arbitrary local files from the web server, potentially leading to source code disclosure, credential theft, or remote code execution where log/upload poisoning is feasible. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Identify WordPress site running Uppercase theme
Delivery
Locate vulnerable theme parameter
Exploit
Send crafted HTTP request with path traversal
Install
PHP include reads wp-config.php
C2
Extract DB credentials and auth keys
Execute
Authenticate as admin and upload backdoor
Impact
Full server compromise
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Vulnerability AssessmentAI

Exploitation The target WordPress site must have the CodeSupply Co. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals are mixed. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated attacker enumerates WordPress sites running the Uppercase theme (e.g., via wp-content/themes/uppercase/ asset paths), then issues a crafted HTTP GET to a vulnerable theme endpoint with a traversal payload in the file/template parameter to read wp-config.php and exfiltrate database credentials and WordPress auth keys. With those, the attacker pivots to authenticated admin access, uploads a malicious plugin, and gains full RCE on the server. …
Remediation Vendor-released patch: upgrade the Uppercase theme to version 1.2.2 or later via the WordPress admin Themes updater or by replacing the theme directory with the patched release; advisory details are at https://patchstack.com/database/wordpress/theme/uppercase/vulnerability/wordpress-uppercase-theme-1-2-2-local-file-inclusion-vulnerability. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

24 hours: Inventory all WordPress installations using Uppercase theme versions prior to 1.2.2 and assess exposure scope. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-39559 vulnerability details – vuln.today
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