Skyvern
Monthly
Server-side template injection in Skyvern's TextPromptBlock before version 1.0.45 allows authenticated workflow users to achieve remote code execution at server process privileges. The flaw arises from a double-rendering design defect: user-controlled workflow parameters are first rendered through a sandboxed Jinja2 environment, then re-rendered through an unsandboxed call inside send_prompt, defeating the sandbox entirely. No public exploit has been identified at time of analysis, but Jinja2 SSTI exploitation is well-documented, making this a low-effort path for any attacker holding a workflow user account.
Server-side template injection in Skyvern's TextPromptBlock before version 1.0.45 allows authenticated workflow users to achieve remote code execution at server process privileges. The flaw arises from a double-rendering design defect: user-controlled workflow parameters are first rendered through a sandboxed Jinja2 environment, then re-rendered through an unsandboxed call inside send_prompt, defeating the sandbox entirely. No public exploit has been identified at time of analysis, but Jinja2 SSTI exploitation is well-documented, making this a low-effort path for any attacker holding a workflow user account.