CVE-2025-49619 is a high-severity vulnerability affecting Skyvern versions up to 0.1.85. The issue is classified under CWE-1336, which involves improper neutralization of special elements used in a template engine. Specifically, this vulnerability arises from a Jinja runtime leak located in the file sdk/workflow/models/block.py. Jinja is a widely used templating engine in Python applications, and improper handling of template elements can lead to information disclosure or injection attacks. In this case, the vulnerability allows an attacker with low privileges (PR:L) and no user interaction (UI:N) to exploit the flaw remotely (AV:N) with low attack complexity (AC:L). The scope of the vulnerability is changed (S:C), meaning the exploit can affect resources beyond the initially vulnerable component. The impact on confidentiality is high (C:H), indicating significant data exposure, while integrity impact is low (I:L), and availability is not affected (A:N). Although no known exploits are currently in the wild, the high CVSS score of 8.5 reflects the serious nature of the vulnerability. The lack of available patches at the time of publication increases the urgency for affected organizations to implement mitigations and monitor for updates. This vulnerability could be leveraged to leak sensitive runtime information from the Jinja template engine, potentially exposing internal logic, credentials, or other confidential data embedded in templates or runtime context.

For European organizations using Skyvern, particularly those integrating it into workflow automation or software development pipelines, this vulnerability poses a significant risk of confidential data leakage. The exposure of sensitive runtime information could lead to further targeted attacks, including privilege escalation or lateral movement within networks. Organizations handling personal data under GDPR may face compliance risks if sensitive information is disclosed. The vulnerability's remote exploitability without user interaction makes it a critical concern for cloud-hosted or externally accessible Skyvern instances. The integrity impact is limited, so direct data manipulation is less likely, but the confidentiality breach alone can have severe operational and reputational consequences. Additionally, the scope change indicates that attackers might access data beyond the initially vulnerable module, increasing the breadth of potential impact.

Given the absence of official patches, European organizations should implement the following specific mitigations: 1) Restrict network access to Skyvern instances, limiting exposure to trusted internal networks or VPNs to reduce attack surface. 2) Employ strict input validation and sanitization on any user-supplied data that interacts with the Jinja templates to minimize injection risks. 3) Enable detailed logging and monitoring around the sdk/workflow/models/block.py component to detect unusual template rendering or access patterns indicative of exploitation attempts. 4) Use application-layer firewalls or runtime application self-protection (RASP) tools that can detect and block suspicious template engine behaviors. 5) Isolate Skyvern environments using containerization or sandboxing to contain potential leaks. 6) Prepare for rapid patch deployment by tracking vendor updates closely and testing patches in staging environments before production rollout. 7) Conduct security reviews of workflows relying on Skyvern to identify and remediate any sensitive data exposure through templates.