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CVE-2025-66698

HighPublished

An issue in Semantic machines v5.4.8 allows attackers to bypass authentication via sending a crafted HTTP request to various API endpoints.

Published: Jan 13, 2026
Updated: Jul 5, 2026
Assigning CNA: mitre
Evidence observed: Aug 9, 2026

Primary CVSS

8.6/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 41.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

An issue in Semantic machines v5.4.8 allows attackers to bypass authentication via sending a crafted HTTP request to various API endpoints.

Sources

CVE-2025-66698PoC
Proof-of-concept for CVE-2025-66698: authentication bypass in Veda v5.4.8 via empty ticket parameter, enabling enumeration of users, policies, and PII through unauthenticated API endpoints.

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