CVE-2026-27961Public exploitNetwork attack vector

Authenticated RCE via unsandboxed Jinja2 evaluator templates

Published Feb 26, 2026 · Updated Feb 26, 2026

Server-side template injection in Agenta before 0.86.8 allows remote authenticated users to execute code through evaluator templates. The _format_with_template methods pass attacker-controlled content to Jinja2 Template(content).render() without a sandbox. Any authenticated platform user can reach the path by selecting the jinja2 template format, gaining the API container's filesystem, environment, and secret access.

CVSS severity8.8
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side template injection in Agenta before 0.86.8 allows remote authenticated users to execute code through evaluator templates. The _format_with_template methods pass attacker-controlled content to Jinja2 Template(content).render() without a sandbox. Any authenticated platform user can reach the path by selecting the jinja2 template format, gaining the API container's filesystem, environment, and secret access.

The record

CVE
CVE-2026-27961
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
Agenta
Product
Agenta
Classifications
CWE-1336, T1059.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 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=< 0.86.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Agenta · Agentaversion=< 0.86.8

Published CVSS scores

8.8GitHub, Inc.CVSS: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.

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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 exploitPublished

Weakness, pattern, technique

CWE-1336Improper Neutralization of Special Elements Used in a Template Engine
T1059.006Command and Scripting Interpreter: Python

Public exploit references

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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