APEX-Harm: Evaluating Agent Safety in Shared Professional Workspaces
APEX-Harm finds script-injection attacks often succeed against frontier agents in shared workspaces.
APEX-Harm benchmarks prompt and script injection against long-horizon agents performing finance, consulting, and legal tasks in shared workspaces. Each task contains 115 to 328 files, with email, calendar, chat, document, spreadsheet, PDF, and code-execution tools exposed through MCP servers. On 180 tasks per model across 12 frontier models, Opus 5 and Sonnet 5 had the lowest attack success rates, 8% and 20%. Task-specific script replacement averaged 81-84% success and generic attacker scripts 73%, while Gemini 3.8 Flash’s 0.877 task score still came with a 33% attack success rate.
- Six attack categories target workspaces of 115 to 328 files.
- Opus 5 and Sonnet 5 had 8% and 20% attack success.
- Task-specific script replacement averaged 81-84% success.
- Generic attacker scripts averaged 73% attack success.
- Gemini 3.8 Flash scored 0.877 with 33% attack success.
- Products
- MCP
- AI models
- Opus 5Sonnet 5Gemini 3.8 Flash
From the original article
1 min read at arxiv.orgProfessional agents increasingly work through command-line interfaces and multiple tools over shared workspaces containing files, messages, and business applications. These environments create safety risks that are difficult to capture with attacks placed at a single, known read location.
By Ziyi Yang · arxiv.org
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