CVE-2026-40151
MediumPublic exploitPraisonAI: Unauthenticated Information Disclosure of Agent Instructions via /api/agents in AgentOS
Published Apr 10, 2026 · Updated Oct 16, 2026 · Also known as GHSA-pm96-6xpr-978x, PYSEC-2026-2919
Key Facts
Routine patching- CVE-2026-40151 is a medium-severity vulnerability (CVSS 5.3 v3.1) affecting PraisonAI.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 0.8% probability of exploitation in the next 30 days.
- Fixed versions are available, including PraisonAI 4.5.128.
- Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
CVSS v3.1
5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS (30-day exploit likelihood)
0.8%
Higher than 57.0% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
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Description
PraisonAI is a multi-agent teams system. Prior to 4.5.128, the AgentOS deployment platform exposes a GET /api/agents endpoint that returns agent names, roles, and the first 100 characters of agent system instructions to any unauthenticated caller. The AgentOS FastAPI application has no authentication middleware, no API key validation, and defaults to CORS allow_origins=["*"] with host="0.0.0.0", making every deployment network-accessible and queryable from any origin by default. This vulnerability is fixed in 4.5.128.
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| PraisonAIPraison | >= < 4.5.128 | 4.5.128 |
Patched Releases
PraisonAI
4.5.128
Timeline
Publicly disclosed
Apr 10, 2026
Last updated
Oct 16, 2026
Weakness Type
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
- advisoryGHSA advisory
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40151.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-40151
- articlehttps://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-pm96-6xpr-978x
- otherhttps://github.com/MervinPraison/PraisonAI
FAQ
Common Questions.
PraisonAI is a multi-agent teams system.
Affected: PraisonAI versions >= < 4.5.128. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including PraisonAI 4.5.128.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
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