CVE-2025-8030 is a high-severity vulnerability affecting Mozilla Firefox and Thunderbird versions prior to Firefox 141, Firefox ESR 128.13 and 140.1, and Thunderbird 141, 128.13, and 140.1. The vulnerability arises from insufficient escaping in the “Copy as cURL” feature. This feature allows users to copy network requests as cURL commands for debugging or replication purposes. Due to improper sanitization of the copied command, an attacker can craft a malicious web page or content that, when a user copies the request as a cURL command and subsequently executes it in a shell environment, could lead to execution of arbitrary code. The vulnerability is classified under CWE-94 (Improper Control of Generation of Code), indicating that user-assisted code injection is possible. The CVSS v3.1 base score is 8.1 (high), with vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N, meaning the attack can be launched remotely without privileges, requires low attack complexity, no privileges, but does require user interaction (copying and executing the command). The impact is high on confidentiality and integrity, as arbitrary code execution could lead to data theft or system compromise, but does not affect availability. There are no known exploits in the wild yet, and no patch links were provided at the time of this report. The vulnerability is significant because it leverages a common developer or advanced user workflow, potentially tricking users into running malicious commands under the guise of legitimate cURL commands copied from Firefox or Thunderbird developer tools or network panels.

For European organizations, the impact of CVE-2025-8030 could be substantial, especially for those relying heavily on Firefox or Thunderbird for daily operations, including government agencies, financial institutions, and enterprises with strong web development or security teams. Successful exploitation could lead to unauthorized disclosure of sensitive data, compromise of internal systems, and lateral movement within networks. Since the attack requires user interaction (copying and executing a crafted cURL command), social engineering or phishing campaigns could be used to trick employees, increasing the risk in environments with less cybersecurity awareness. The confidentiality and integrity of critical data could be severely impacted, potentially leading to regulatory non-compliance under GDPR if personal data is exposed. The lack of availability impact reduces the chance of immediate service disruption but does not mitigate the risk of stealthy breaches or persistent threats.

Organizations should prioritize updating Firefox and Thunderbird to versions 141 or later (or ESR 128.13/140.1 or later) as soon as patches become available. Until patches are released, organizations should implement strict user education and awareness campaigns to warn users about the risks of executing copied cURL commands from untrusted sources. Security teams should monitor for suspicious user behavior involving command-line execution of copied commands. Endpoint protection solutions should be configured to detect and block suspicious shell commands that resemble malicious cURL invocations. Additionally, restricting the use of developer tools or limiting the ability to copy network requests in sensitive environments can reduce exposure. Network segmentation and application whitelisting can further limit the impact of any successful exploitation. Finally, organizations should review and enhance phishing defenses to prevent attackers from delivering malicious payloads that rely on this vulnerability.