CVE-2026-61435 PraisonAI before 4.6.78 Authentication Bypass via Host Header Spoofing
Remote attackers can bypass authentication and invoke agents by spoofing the Host header when authentication is disabled in configuration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-61435?
CVE-2026-61435 is a high-severity authentication bypass vulnerability in MervinPraison PraisonAI, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
PraisonAI before 4.6.78 contains an authentication bypass in the Call API agent invocation endpoints (src/praisonai/praisonai/api/agent_invoke.py) when PRAISONAI_CALL_AUTH=disabled is configured. The safeguard intended to restrict the disabled-auth opt-out to localhost binding derives the bind host from request.url.hostname, which is taken from the client-controlled HTTP Host header. A remote, unauthenticated attacker who can reach the service over the network can send a spoofed 'Host: 127.0.0.1' header to bypass the localhost-only restriction and list (GET /api/v1/agents) and invoke (POST /api/v1/agents/{agent_id}/invoke) registered agents without authentication.
Weakness: CWE-287
Which versions are affected by CVE-2026-61435?
3 open source packages ship an affected version, including praisonai.
| Package | Affected | Fixed in |
|---|---|---|
praisonai PyPI | All versions | 4.6.78 |
praisonai PyPI | All versions | 4.6.78 |
praisonai PyPI | All versions | 4.6.78 |
How do I fix CVE-2026-61435?
Upgrade praisonai to 4.6.78 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-61435 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-61435 exists.
Sources
Also known as CVE-2026-62174, GHSA-2gpf-2492-q9jh, PYSEC-2026-4247.