Security readout for executives and security teams
Plain-English summary
CVE-2026-27961 affects Agenta platform deployments before version 0.86.8. A user with evaluator access could abuse custom Jinja2 evaluator templates so the server runs unintended code. The issue is high urgency for organizations self-hosting or using managed Agenta because it can impact confidentiality, integrity, and availability of the API server.
Executive priority
Prioritize remediation for any Agenta platform deployment before 0.86.8, especially where evaluator features are available to multiple users. The business risk is server-side code execution in an LLMOps platform, which can threaten sensitive data, service integrity, and availability.
Technical view
The vulnerability is a server-side template injection in Agenta API server evaluator template rendering. Although the vulnerable code is in the SDK package, the advisory states it executes server-side inside the API process when evaluators run. It does not affect standalone SDK usage. CVSS 3.1 is 8.8: network exploitable, low complexity, low privileges required, no user interaction.
Likely exposure
Exposure is limited to self-hosted or managed Agenta platform deployments running versions before 0.86.8 where users can create or run custom evaluators. Standalone SDK-only use is not affected according to the provided advisory information.
Exploitation context
The CVSS vector indicates exploitation requires network access and low privileges, but no user interaction. The source bundle does not indicate known active exploitation, and the CVE is not marked KEV. Do not assume exploitation in the wild without additional evidence.
Researcher notes
The key distinction is execution context: vulnerable code is in the SDK package but becomes exploitable when invoked server-side by the API process during evaluator rendering. Available sources name the fixed version but do not provide further exploit telemetry or broader affected product details.
Mitigation direction
- Upgrade Agenta platform deployments to version 0.86.8 or later.
- Review vendor advisory GHSA-cfr2-mp74-3763 for deployment-specific guidance.
- Restrict evaluator creation and execution to trusted users until upgraded.
- Inventory managed and self-hosted Agenta instances for versions below 0.86.8.
Validation and detection
- Confirm Agenta platform version is 0.86.8 or later.
- Identify whether the deployment runs the Agenta API server evaluators.
- Verify standalone SDK-only use is not being misclassified as platform exposure.
- Review evaluator access controls for least-privilege configuration.
- Check logs for unusual evaluator activity, without assuming compromise.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-1336: Exact CWE lookup
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Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-27961 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/Agenta-AI/agenta/security/advisories/GHSA-cfr2-mp74-3763CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements Used in a Template Engine
Improper Neutralization of Special Elements Used in a Template Engine represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.