EUVD-2026-68096
GHSA-57gg-9j2p-5v4x
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable via authenticated workflow submission, low complexity, PR:L required; no scope change assessed consistent with CVSS 4.0 SC:N baseline.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
Skyvern before 1.0.45 contains a sandbox escape vulnerability in TextPromptBlock that renders prompts twice, first through a sandboxed Jinja environment and then through an unsandboxed environment. Attackers can inject malicious Jinja template syntax through workflow parameters or upstream block output to execute arbitrary code with server process privileges.
AnalysisAI
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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authenticated Skyvern user account with permission to create or modify workflows (CVSS PR:L confirms low-privilege authentication). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.7 with vector AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H is consistent with the actual exploitation profile: network-reachable, no special attack conditions, low-privilege authentication required, and full confidentiality, integrity, and availability impact on the vulnerable system. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Skyvern 1.0.45 or later, which resolves the double-render by removing parameter_values from send_prompt's signature and ensuring all template rendering occurs exclusively through the sandboxed format_potential_template_parameters() call. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Skyvern deployments and identify those running versions before 1.0.45, prioritizing systems where external or untrusted users have workflow access. …
Sign in for detailed remediation steps and compensating controls.
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