CVE-2026-104350 in Campaign Classic
Summary
by MITRE • 10/27/2026
Adobe Campaign Classic (ACC) is affected by a reflected Cross-Site Scripting (XSS) vulnerability. An attacker could exploit this vulnerability to inject malicious scripts into a web page, potentially gaining elevated access or control over the victim's account or session. Exploitation of this issue requires user interaction in that a victim must visit a maliciously crafted URL or interact with a compromised web page. Scope is changed.
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Analysis
by VulDB Data Team • 10/27/2026
Adobe Campaign Classic contains a reflected Cross-Site Scripting vulnerability within its web interface components, allowing an attacker to inject executable client-side scripts into HTTP responses without proper sanitization of user-supplied input. This flaw typically arises when the application processes query parameters or form data and immediately reflects them back in the HTML output without adequate encoding or validation mechanisms. The nature of this reflected XSS means that the malicious payload is not stored on the server but is instead delivered via a crafted URL, requiring an attacker to trick a user into visiting a specific link containing the exploit code. This interaction model distinguishes it from persistent attacks and places the burden of exploitation on social engineering or phishing tactics to direct victims to the malicious endpoint.
The technical impact of this vulnerability extends beyond simple script execution, as successful exploitation can lead to significant security compromises within the Adobe Campaign Classic environment. An attacker who successfully injects scripts into a victim's browser session gains the ability to execute arbitrary JavaScript in the context of the vulnerable application. This capability allows for session hijacking, where the attacker extracts sensitive cookies or authentication tokens to impersonate the legitimate user. Furthermore, it enables credential harvesting through fake login forms that mimic the authentic interface, data exfiltration by sending confidential campaign data to external servers, and potentially defacement of the user's view. In enterprise environments, this can facilitate lateral movement if the compromised session has administrative privileges or access to sensitive customer databases managed by the platform.
From a classification perspective, this vulnerability aligns with CWE-79 Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting and is categorized under ATT&CK technique T1059 Command and Scripting Interpreter specifically within the context of browser-based execution via DOM manipulation or event handlers. The requirement for user interaction classifies this as a low-complexity attack vector that relies heavily on social engineering to achieve initial access, making it critical to address both technical controls and user awareness training.
Mitigation strategies should focus on implementing robust input validation and output encoding practices within the application codebase. Developers must ensure that all data derived from HTTP requests is properly encoded before being rendered in HTML responses, utilizing context-aware escaping techniques for HTML entities, JavaScript strings, CSS properties, and URL parameters where applicable. Additionally, deploying a Web Application Firewall can provide an additional layer of defense by filtering out malicious payloads based on known attack signatures and behavioral patterns. Enforcing strict Content Security Policy headers is also recommended to restrict the sources from which scripts can be loaded and executed, thereby mitigating the impact even if some injection attempts succeed. Regular security assessments and code reviews should be conducted to identify similar input handling flaws across other modules of Adobe Campaign Classic.