CVE-2026-22378: 
WordPress vulnerability analysis and mitigation

CVE-2026-22378 is a PHP Local File Inclusion (LFI) vulnerability in the AncoraThemes Blabber WordPress theme, affecting all versions through 1.7.0. The flaw is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program) and allows unauthenticated remote attackers to include and execute arbitrary local files on the server. It was reported by Tran Nguyen Bao Khanh (VCI - VNPT Cyber Immunity) on November 30, 2025, and published on February 17–20, 2026. The vulnerability carries a CVSS v3.1 base score of 8.1 (High) (Patchstack, Feedly).

The vulnerability stems from improper handling of user-supplied input used in PHP include/require statements within the Blabber theme (CWE-98), enabling PHP Local File Inclusion. An unauthenticated attacker can manipulate a filename parameter passed to a PHP file inclusion function, causing the server to load and execute arbitrary local files. No authentication or user interaction is required, though the attack complexity is rated High, suggesting some precondition or constraint must be met (e.g., specific server configuration or parameter guessing). The vulnerability is mapped to CAPEC-193 (PHP Remote File Inclusion) and was discovered and reported through Patchstack's coordinated disclosure process (Patchstack).

Successful exploitation allows an attacker to read sensitive local files on the web server, including configuration files containing database credentials, which could lead to complete database takeover. Beyond information disclosure, LFI vulnerabilities can be chained with other techniques (e.g., log poisoning or PHP session file inclusion) to achieve remote code execution, potentially resulting in full server compromise. The confidentiality, integrity, and availability impacts are all rated High, meaning an attacker could exfiltrate sensitive data, modify site content, and disrupt service availability (Patchstack, Feedly).

As of the time of disclosure, no public proof-of-concept exploit code has been confirmed, and there is no evidence of active in-the-wild exploitation. The EPSS score is approximately 0.0015 (0.15%), indicating a currently low probability of exploitation in the near term. No threat actor attribution has been made, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. However, Patchstack notes that vulnerabilities of this type and severity are commonly used in mass-exploit campaigns targeting WordPress sites at scale (Patchstack, Feedly).

1. Reconnaissance: Identify WordPress sites using the Blabber theme (version ≤ 1.7.0) via passive scanning tools (e.g., WPScan, Shodan, or Google dorks such as inurl:wp-content/themes/blabber).
2. Identify vulnerable parameter: Analyze the Blabber theme's PHP source code or HTTP responses to locate a file inclusion parameter that accepts user-controlled input (e.g., a template, file, or page parameter in a theme function).
3. Craft LFI payload: Construct a request with a path traversal payload targeting sensitive files, such as ../../../../etc/passwd or ../../../../wp-config.php, to read server credentials or configuration.
4. Escalate to RCE (optional): If PHP session files or server logs are writable and accessible, inject PHP code into a log file (log poisoning) and then include it via the LFI vector to achieve remote code execution.
5. Exfiltrate or persist: Use gained credentials or code execution to access the database, create backdoor accounts, or deploy a web shell for persistent access (Patchstack).

• Network: HTTP GET or POST requests to Blabber theme endpoints containing path traversal sequences (e.g., ../, ..%2F, ....//) or references to sensitive files (/etc/passwd, wp-config.php) in query parameters.
• Logs: Web server access logs showing requests with encoded traversal strings or unusual file path values in theme-related parameters; repeated 200 responses to requests with suspicious file inclusion patterns.
• File System: Unexpected PHP web shells or newly created files in the wp-content/themes/blabber/ directory; modified theme files with injected PHP code.
• Process: Unusual child processes spawned by the web server process (e.g., bash, curl, wget) that may indicate successful RCE via log poisoning chained with LFI.

As of the disclosure date, no official patch from AncoraThemes is available for the Blabber theme. Site owners should consider removing or disabling the theme until a patched version (above 1.7.0) is released. Patchstack has issued a virtual patching/mitigation rule for its subscribers to block exploitation attempts in the interim. Additional mitigations include implementing a Web Application Firewall (WAF) to filter path traversal patterns, restricting PHP file inclusion via open_basedir settings, and monitoring application logs for suspicious file inclusion attempts (Patchstack, Feedly).

The vulnerability was covered in Wordfence's weekly WordPress vulnerability report for the period of February 16–22, 2026, highlighting it as part of a broader set of WordPress theme and plugin vulnerabilities. Social media mentions appeared on Mastodon and Bluesky via TheHackerWire, indicating moderate community awareness. Patchstack, which coordinated the disclosure, emphasized the risk of mass-exploit campaigns targeting vulnerabilities of this class and severity in WordPress ecosystems (Wordfence Blog, Patchstack).