CVE-2026-82447Network attack vectorHinoki check available

Authenticated code execution via unsandboxed second render

Published Aug 29, 2026 · Updated Aug 29, 2026

Server-side template injection in Skyvern 0.2.1 through 1.0.44 allows remote authenticated users to execute arbitrary code. TextPromptBlock first substitutes workflow parameters or upstream block output in a sandboxed Jinja render, then sends the resulting text to PromptEngine.load_prompt_from_string for a second render in a plain Jinja environment. Authenticated workflow access is required, and injected expressions run with the Skyvern server process privileges.

CVSS severity8.7
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Server-side template injection in Skyvern 0.2.1 through 1.0.44 allows remote authenticated users to execute arbitrary code. TextPromptBlock first substitutes workflow parameters or upstream block output in a sandboxed Jinja render, then sends the resulting text to PromptEngine.load_prompt_from_string for a second render in a plain Jinja environment. Authenticated workflow access is required, and injected expressions run with the Skyvern server process privileges.

The record

CVE
CVE-2026-82447
Published
Aug 29, 2026
Updated
Aug 29, 2026
Vendor
Skyvern
Product
Skyvern
Classifications
CWE-1336, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.2.1 <1.0.45

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Skyvern · Skyvernversion=0.2.1 <1.0.45

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1336Improper Neutralization of Special Elements Used in a Template Engine
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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