CVE-2026-83544 in Greenshift Plugin
Summary
by MITRE • 09/05/2026
The Greenshift WordPress plugin before 13.2.0 does not properly escape a block animation attribute before outputting it within an HTML attribute, allowing users with contributor-level access and above to inject arbitrary web scripts that execute when the content is viewed.
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Analysis
by VulDB Data Team • 09/05/2026
The vulnerability identified in versions of the Greenshift WordPress plugin prior to 13.2.0 represents a significant security flaw rooted in insufficient input validation and output encoding mechanisms. Specifically, the defect lies within the handling of block animation attributes during the rendering process. When user-supplied data is processed for these animations, the application fails to properly escape special characters before embedding them into HTML attribute contexts. This lack of sanitization creates an injection vector that allows malicious actors to manipulate the structure and content of web pages served by the vulnerable software. The core technical failure is a classic case of improper neutralization of special elements within data used in output, which directly facilitates cross-site scripting attacks against end users interacting with the compromised site.
From an operational perspective, this vulnerability enables stored or reflected cross-site scripting depending on how the animation attributes are utilized and persisted. Users possessing contributor-level access or higher privileges can exploit this flaw to inject arbitrary JavaScript code into the page content. Because WordPress assigns specific capabilities based on user roles, a contributor is typically allowed to create and edit posts but does not have administrative control over plugins or themes. This lower privilege level makes the vulnerability particularly dangerous as it lowers the barrier for exploitation significantly compared to requiring administrator access. When an attacker successfully injects malicious scripts through these animation attributes, those scripts execute in the context of any user who views the affected content, including administrators and regular visitors.
The impact of this cross-site scripting vulnerability extends beyond simple defacement or nuisance alerts. Attackers can leverage executed JavaScript to perform session hijacking by stealing authentication cookies, thereby impersonating legitimate users and potentially escalating privileges within the WordPress environment. Furthermore, malicious scripts can be used to redirect victims to phishing sites designed to harvest credentials, inject malware payloads into the user's browser through drive-by downloads, or conduct click fraud against advertising networks embedded in the site. The persistence of stored XSS vectors means that every visitor to a compromised page becomes a potential victim without any direct interaction required from them beyond loading the webpage, amplifying the blast radius of the exploit across the entire audience base.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-79, which classifies improper neutralization of input during web page generation as cross-site scripting. In terms of tactical mapping within the MITRE ATT&CK framework for enterprise security, this flaw facilitates techniques associated with Client-side Injection such as XSS (T1059) and potentially Data from Information Repositories if used to exfiltrate data via beaconing mechanisms. The exploitation chain typically involves crafting a malicious animation attribute value containing encoded script tags or event handlers like onerror or onload, which bypasses the application's naive filtering logic due to the absence of context-aware encoding for HTML attributes.
Mitigation strategies must address both immediate remediation and long-term security hygiene. The primary and most effective solution is to upgrade the Greenshift plugin to version 13.2.0 or later, where this specific input validation flaw has been corrected by implementing robust output escaping functions tailored to HTML attribute contexts. For organizations unable to patch immediately due to compatibility constraints, temporary mitigations may include restricting contributor-level access to trusted individuals only and employing a Web Application Firewall configured with rulesets capable of detecting and blocking cross-site scripting payloads in POST requests or content fields. Additionally, enforcing Content Security Policy headers can help mitigate the impact by preventing unauthorized script execution even if an injection attempt succeeds, thereby reducing the effectiveness of any exploited vulnerability until permanent fixes are applied.