CVE-2026-84924 in Email Verification Plugin
Summary
by MITRE • 10/22/2026
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Email Verification / SMS Verification / OTP Verification allows Reflected XSS. This issue affects Email Verification / SMS Verification / OTP Verification versions: from 0.0.0 to 2.4.0.
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Analysis
by VulDB Data Team • 10/22/2026
The identified security flaw resides within the Drupal modules responsible for email, SMS, and one-time password verification processes, specifically affecting version ranges from initial releases up through 2.4.0. This vulnerability is classified as an improper neutralization of input during web page generation, commonly known as Cross-Site Scripting or XSS. The core technical deficiency lies in the application's failure to adequately sanitize user-supplied data before it is rendered back into the HTML context of the verification interface. When a user interacts with these modules, such as by entering an email address, phone number, or OTP code that contains malicious script payloads, the system processes this input without applying sufficient encoding or validation rules. Consequently, the untrusted data is embedded directly into the page structure, allowing arbitrary JavaScript to execute within the victim's browser session under the context of the vulnerable Drupal site.
This specific implementation represents a Reflected XSS vulnerability rather than a stored variant. In reflected attacks, the malicious payload is typically delivered via a crafted URL or form submission that triggers an immediate response from the server containing the injected script. The attacker must entice a target user to visit this specially constructed link, often through social engineering tactics such as phishing emails or deceptive web links. Once the victim's browser processes the reflected content, the embedded JavaScript executes with the privileges of the logged-in user session associated with that Drupal instance. This execution environment grants the malicious script access to sensitive cookies, local storage data, and potentially administrative functions if the targeted user holds elevated permissions within the CMS ecosystem.
The operational impact of this vulnerability is significant due to its potential for account takeover and data exfiltration. An attacker leveraging this flaw can steal session tokens, effectively hijacking active user sessions without needing valid credentials. This capability extends to stealing sensitive personal information provided during the verification process or accessing restricted administrative areas if an administrator falls victim to the attack vector. Furthermore, the vulnerability facilitates broader attacks such as keylogging within the application context, redirection to malicious phishing sites designed to harvest additional credentials, and defacement of the user interface by injecting deceptive content that mimics legitimate system messages. The trust boundary between the Drupal platform and its users is compromised, undermining the integrity and confidentiality assurances provided by the verification modules intended to secure access.
From a classification perspective, this issue aligns with CWE-79: Improper Neutralization of Input During Web Page Generation (Cross-site Scripting). It also maps to MITRE ATT&CK technique T1059.005: JavaScript, which describes how attackers use client-side scripts for execution and persistence. The attack vector is categorized under Initial Access via Spearphishing Link or Exploitation of Remote Services depending on the delivery method employed by the adversary. To mitigate this risk, immediate action must be taken to upgrade all affected Drupal modules to a version newer than 2.4.0 where these input sanitization flaws have been addressed by the developers. In environments where upgrading is not immediately feasible, implementing strict Content Security Policy headers can help restrict script execution sources and reduce the impact of successful XSS attempts. Additionally, deploying Web Application Firewalls with robust XSS detection rules may provide a layer of defense against exploitation attempts while patching procedures are finalized.