CVE-2026-7439CWE-346

AgentFlow Local Web API Content-Type Validation Bypass

Medium · published April 29, 2026

CVSS v4.0
4.8
EPSS
0%
Percentile
1.8
In the wild
Unconfirmed
What it is

AgentFlow's local web API accepts non-JSON content types on POST /api/runs and POST /api/runs/validate endpoints without enforcing application/json validation, allowing attackers to bypass trust-boundary enforcement on sensitive operations. Attackers can exploit this content-type validation weakness through browser-driven or local cross-origin requests to abuse the localhost API and enable attack chains against the local control plane.

The record
Technical detail
CVSS v4.0
4.8 · MEDIUM
Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00121 · 1.8th percentile
Weakness
CWE-346 · Origin Validation Error
Published
2026-04-29T18:06Z
EPSS history
Timeline
  • 29 APR 18:06Z
    AgentFlow Local Web API Content-Type Validation Bypass
    cvelistv5