Cross-Site Scripting (XSS) in praisonai (CVE-2026-40112)
Summary
Cross-site scripting in praisonai (CVE-2026-40112). Risk of unauthorized operations or information disclosure. Exploitable via _sanitize_html. Mitigation: upgrade to 4.5.128 or later.
Original description
The description as published by the source.
Summary
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.
Details
In src/praisonai/api.py, lines 6-14 define the sanitizer with a try/except ImportError fallback:
try:
import nh3
def _sanitize_html(html: str) -> str:
return nh3.clean(html)
except ImportError:
def _sanitize_html(html: str) -> str:
"""Fallback: no nh3, return as-is (install nh3 for XSS protection)."""
return html
The home() route at lines 21-25 converts agent output to HTML via markdown.markdown() (which preserves raw HTML tags by default) and embeds it in an HTML response using an f-string — bypassing Flask's Jinja2 auto-escaping:
@app.route('/')
def home():
output = basic()
html_output = _sanitize_html(markdown.markdown(str(output)))
return f'{html_output}'
Since nh3 is not in any dependency list (pyproject.toml core deps, optional deps, or requirements files), a standard installation will always hit the fallback pat…
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-40112 has been found in praisonai.
Attackers can target a specific entry point like _sanitize_html over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade praisonai to 4.5.128 or later.
If unsure, ask your IT team or search "praisonai CVE-2026-40112" on the vendor's site.
CVE-2026-40112 (praisonai) — CWE-79
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: _sanitize_html / nh3 / pyproject.toml / markdown
Patched: 4.5.128 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Cross-site scripting (XSS) (CWE-79) exists in praisonai. Attackers reach the vulnerable code path via _sanitize_html without authentication.
Check the vendor advisory for the affected versions of praisonai. Attack surface: _sanitize_html / nh3 / pyproject.toml / markdown.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 4.5.128.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'praisonai' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'praisonai' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
praisonaiを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade praisonai to 4.5.128ステージング環境で 4.5.128 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com