PraisonAI: Call API localhost-only authentication bypass via spoofed Host header

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.2 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

EPSS

• CVE-2026-61435: 0.49% estimated exploitation activity in the next 30 days; percentile 42.13 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Call API localhost-only authentication bypass via spoofed Host header Summary PraisonAI's patched PRAISONAICALLAUTH=disabled safeguard for the n8n/call agent invocation API can be bypassed with a spoofed Host: 127.0.0.1 header, allowing an unauthenticated network caller to list and invoke registered agents when the service is reachable and the opt-out is enabled. Technical Details The affected code is src/praisonai/praisonai/api/agentinvoke.py. verifytoken() is used as a FastAPI dependency for the /api/v1/agents routes, including POST /api/v1/agents/{agentid}/invoke. Current code no longer unconditionally skips authentication when PRAISONAICALLAUTH=disabled; it tries to allow that opt-out only for localhost binding: The violated invariant is that "localhost binding" must be a server-owned startup or socket property. The implementation instead reads request.url.hostname, which is derived from the HTTP Host header for the current request. A remote caller can therefore send Host:…

Published by the source

8 Oct 2026, 19:36 UTC

Last modified by the source

15 Oct 2026, 14:56 UTC

Source last checked

26 Oct 2026, 13:55 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-2gpf-2492-q9jh

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-2gpf-2492-q9jh

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-2gpf-2492-q9jh

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# Patch Next advisory brief: CVE-2026-61435

Advisory: PraisonAI: Call API localhost-only authentication bypass via spoofed Host header
IDs: CVE-2026-61435, GHSA-2gpf-2492-q9jh
Record: https://patchnext.com/advisories/cve-2026-61435 (revision 3, source checked 26 Oct 2026, 13:55 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: praisonai 4.6.78. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI praisonai: affected <= 4.6.77; fixed in 4.6.78

## Suggested inspection (read-only)
- `python -m pip show praisonai`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on praisonai.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-2gpf-2492-q9jh (GitHub-reviewed advisory GHSA-2gpf-2492-q9jh lists affected ranges: PyPI praisonai >=0 <=4.6.77)
- Verified: https://osv.dev/vulnerability/GHSA-2gpf-2492-q9jh (OSV record GHSA-2gpf-2492-q9jh lists affected ranges: PyPI praisonai >=0 <4.6.78 (fixed))

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