CVE-2026-112863 in KALLYAS Plugin
Summary
by MITRE • 10/23/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Hogash KALLYAS kallyas allows Reflected XSS.This issue affects KALLYAS: from n/a through 4.25.0.
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Analysis
by VulDB Data Team • 10/23/2026
The identified security flaw represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting or XSS. Specifically, this vulnerability manifests as a Reflected XSS within the Hogash KALLYAS content management system. This type of attack occurs when an application receives data in an HTTP request and includes that unsafe data into its output without validating or encoding it properly for safe use in HTML. In the context of KALLYAS versions ranging from n/a through 4.25.0, this indicates a systemic failure to sanitize user-supplied input before rendering it back to the browser. The reflected nature of the vulnerability means that the malicious script is not stored on the server but is instead immediately returned as part of an HTTP response, typically triggered by a crafted URL or form submission where attacker-controlled data is echoed into the page content.
From a technical perspective, this flaw allows attackers to inject client-side scripts such as JavaScript, HTML tags, ActiveX controls, Flash applets, or other executable code into web pages viewed by other users. When a victim user clicks on a specially crafted link that contains malicious payload parameters in the query string or form data, the vulnerable KALLYAS application processes this input and reflects it directly back to the browser without adequate encoding. The browser then interprets these injected scripts as legitimate content from the trusted domain of the web application. This bypasses standard security mechanisms like the same-origin policy because the malicious code is executed in the context of the target site, granting it access to cookies, session tokens, and other sensitive information stored by that specific website for the user's account.
The operational impact of this vulnerability is significant due to its potential for widespread exploitation through social engineering tactics. An attacker can craft a deceptive link containing the malicious payload and distribute it via email, instant messaging, or embedded in another webpage. When an authenticated administrator or regular user interacts with this link, their browser executes the injected script. This execution enables several severe consequences including session hijacking, where the attacker steals the victim's authentication cookies to impersonate them; credential theft by redirecting login forms to a phishing site that captures usernames and passwords; and defacement of the website content if the script modifies the DOM structure. Furthermore, in enterprise environments running KALLYAS, this can serve as an initial vector for more complex attacks such as keylogging or spreading malware via drive-by downloads if the payload is sophisticated enough to exploit additional browser vulnerabilities.
This vulnerability aligns with CWE-79, which defines Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS), and maps directly to the MITRE ATT&CK technique T1059.007, specifically JavaScript execution under client-side scripting. The reflection aspect places it within the broader category of injection attacks where untrusted data is sent to an interpreter as part of a command or query. To mitigate this risk, developers must implement strict input validation and output encoding strategies. All user-supplied data should be validated against expected formats such as length, type, syntax, and range before processing. More critically, when rendering data in HTML contexts, it must be encoded using appropriate methods like HTML entity encoding to ensure that special characters are treated as literal text rather than executable code. Implementing Content Security Policy headers can also provide an additional layer of defense by restricting the sources from which scripts can be loaded and executed. Upgrading KALLYAS to a version beyond 4.25.0 where this issue has been patched is the most effective remediation step for organizations currently affected by this flaw.