EUVD-2026-21154
GHSA-cfg2-mxfj-j6pw
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Lifecycle Timeline
4Description
PraisonAI is a multi-agent teams system. Prior to 4.5.128, the Flask API endpoint in src/praisonai/api.py renders agent output as HTML without effective sanitization. The _sanitize_html function relies on the nh3 library, which is not listed as a required or optional dependency in pyproject.toml. When nh3 is absent (the default installation), the sanitizer is a no-op that returns HTML unchanged. An attacker who can influence agent input (via RAG data poisoning, web scraping results, or prompt injection) can inject arbitrary JavaScript that executes in the browser of anyone viewing the API output. This vulnerability is fixed in 4.5.128.
Analysis
Stored cross-site scripting (XSS) in PraisonAI versions prior to 4.5.128 allows remote attackers to inject arbitrary JavaScript into agent output rendered by the Flask API endpoint. The vulnerability exists because the _sanitize_html function depends on the nh3 library, which is not declared as a required dependency in pyproject.toml; when nh3 is absent (default installation), HTML sanitization becomes a no-op. …
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