CVE-2025-67633 identifies a DOM-based Cross-site Scripting (XSS) vulnerability in the Greenhouse Job Board product developed by brownbagmarketing, affecting versions up to and including 2.7.3. DOM-based XSS occurs when client-side scripts write untrusted data to the Document Object Model without proper sanitization, enabling attackers to execute arbitrary JavaScript in the context of the victim's browser. This vulnerability stems from improper neutralization of input during web page generation, meaning that user-supplied data is not correctly sanitized or encoded before being inserted into the page's DOM. An attacker could exploit this by crafting a malicious URL or input that, when processed by the vulnerable job board, executes attacker-controlled scripts in the victim’s browser. Such scripts can steal session cookies, perform actions on behalf of the user, or redirect users to malicious sites. The vulnerability does not require authentication, increasing its risk profile, and no patches or exploit code are currently publicly available. The lack of a CVSS score indicates that the vulnerability is newly disclosed and pending further analysis. The vulnerability was reserved and published in December 2025, indicating recent discovery. The absence of known exploits in the wild suggests that immediate exploitation is not widespread but the risk remains significant due to the nature of DOM-based XSS. Organizations using Greenhouse Job Board should be aware of this issue and prepare to apply fixes or mitigations promptly.

For European organizations, the impact of CVE-2025-67633 can be substantial, particularly for those relying on the Greenhouse Job Board for recruitment and HR functions. Exploitation could lead to unauthorized access to user sessions, enabling attackers to impersonate legitimate users, access sensitive candidate or employee data, and potentially manipulate job postings or application data. This could result in data breaches violating GDPR requirements, leading to regulatory fines and reputational harm. Additionally, attackers could use the vulnerability to distribute malware or conduct phishing campaigns targeting job applicants or HR personnel. The disruption of recruitment processes could also affect business operations and hiring timelines. The vulnerability’s exploitation does not require user authentication, increasing the attack surface and risk. European organizations with public-facing job boards are especially vulnerable to drive-by attacks or targeted exploitation. The absence of known exploits currently reduces immediate risk but does not eliminate the potential for future attacks once exploit code becomes available.

To mitigate CVE-2025-67633, organizations should first monitor for official patches or updates from brownbagmarketing and apply them promptly once released. In the interim, implement strict input validation and output encoding on all user-supplied data processed by the job board, focusing on sanitizing data before insertion into the DOM. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS payloads. Conduct regular security assessments and penetration testing focused on client-side scripting vulnerabilities. Educate HR and recruitment staff about the risks of suspicious URLs or inputs. Where feasible, restrict access to the job board to trusted networks or authenticated users to reduce exposure. Monitor web server and application logs for unusual activity or signs of attempted exploitation. Finally, consider deploying web application firewalls (WAFs) with rules designed to detect and block XSS attacks targeting the job board.