# CVE-2025-49619: Skyvern - RCE

> Live exploitation tracking for CVE-2025-49619 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2025-49619

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 8.5
- **Public exploit available:** Yes
- **Affected products:** Skyvern
- **Weaknesses:** CWE-1336 (Improper Neutralization of Special Elements Used in a Template Engine)
- **Tags:** web_application

## Description

Skyvern through 0.1.85 is vulnerable to server-side template injection (SSTI) in the Prompt field of workflow blocks such as the Navigation v2 Block. Improper sanitization of Jinja2 template input allows authenticated users to inject crafted expressions that are evaluated on the server, leading to blind remote code execution (RCE).

## CrowdSec analysis

[CVE-2025-49619](https://euvd.enisa.europa.eu/vulnerability/CVE-2025-49619) is a server-side template injection (SSTI) vulnerability in Skyvern through version 0.1.85, affecting workflow blocks like the Navigation v2 Block. Due to improper sanitization of Jinja2 template input, authenticated users can inject malicious expressions into the Prompt field, resulting in blind remote code execution on the server. This flaw could allow attackers to execute arbitrary commands and potentially compromise sensitive data or system integrity.

CrowdSec has been tracking this vulnerability and its exploits since 17th of September 2025.

CrowdSec has not observed any significant exploitation activity targeting CVE-2025-49619 across its network. As a result, no community-driven trend analysis is available for this vulnerability at this time.

Attackers exploit the Skyvern Workflow Editor by sending crafted POST requests to `/api/v1/workflows` with malicious Jinja2 template payloads in the `prompt` field, enabling remote code execution when the workflow is rendered. These attacks require a valid API key and typically target authenticated endpoints related to workflow creation and execution.

## Timeline

- 2025-06-07: CVE Published. CVE-2025-49619 is published to NVD.
- 2025-09-17: Rule Released. CrowdSec releases a rule to detect CVE-2025-49619 exploitation attempts against the CrowdSec Network.
- 2025-12-27: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2025-49619 for the first time.

## References

- https://github.com/Skyvern-AI/skyvern/commit/db856cd8433a204c8b45979c70a4da1e119d949d
- https://cristibtz.github.io/posts/CVE-2025-49619/
- https://github.com/XiaomingX/data-cve-poc/blob/main/2025/CVE-2025-49619/exploit.py

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2025-49619) follows observed exploitation activity for CVE-2025-49619. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.