LLM05: Improper Output Handling
Downstream systems blindly execute, render, or store untrusted model output (XSS, RCE, SSRF via tool calls).
Last reviewed July 2026
The gap LLM05 closes
In OWASP LLM Top 10, Improper Output Handling addresses output handling. Downstream systems blindly execute, render, or store untrusted model output (XSS, RCE, SSRF via tool calls). Penaxtra records this control at high severity and establishes its state by exercising it against the running system, so the result reflects observed behavior rather than a documented assertion.
How Penaxtra delivers LLM05
Penaxtra ships adversarial probe families that target improper output handling directly. Each probe runs against the live endpoint on a schedule, and every triggering response is scored by three independent judges and a meta-judge before it is recorded as a finding under the LLM05 identifier. The OWASP LLM Top 10 LLM05 identifier is attached when the finding is created, so it appears in the exported evidence pack already mapped to the control. Where the same weakness maps to another framework, the finding carries those control identifiers as well.
LLM05 capabilities
Findings tagged with the OWASP LLM Top 10 LLM05 identifier
Penaxtra severity for this control (high)
Cross-framework identifiers attached to the same finding where controls overlap
PDF and JSON evidence export with the control identifier attached
LLM05 compliance mapping
Findings for LLM05 carry the OWASP LLM Top 10 LLM05 identifier along with the corresponding control identifiers in the other frameworks Penaxtra maps, so one result is reflected across each mapped framework.
Frequently asked
What is LLM05 (Improper Output Handling)?
Downstream systems blindly execute, render, or store untrusted model output (XSS, RCE, SSRF via tool calls). It is a OWASP LLM Top 10 control; Penaxtra assesses it at high severity.
How does Penaxtra test for LLM05?
Penaxtra ships adversarial probe families that target improper output handling directly. Each probe runs against the live endpoint on a schedule, and every triggering response is scored by three independent judges and a meta-judge before it is recorded as a finding under the LLM05 identifier.
Does a finding for LLM05 help with an audit?
Each finding is tagged with the OWASP LLM Top 10 LLM05 identifier and exported in the PDF and JSON evidence pack, so it appears on the auditor control list with the identifier already attached.