CVE-2026-48558

As of 2026-06-13, CVE-2026-48558 is a CVSS 10 (CRITICAL-severity) vulnerability. EPSS exploitation probability 0.7%. Threadlinqs Intelligence tracks 2 threats exploiting it.

Last updated: 2026-06-13

SimpleHelp versions 5.5.15 and prior and 6.0 pre-release versions contain an authentication bypass vulnerability in the OIDC authentication flow. When OIDC authentication is configured, identity tokens submitted during login are accepted without verifying their cryptographic signature. In a vulnerable configuration, a remote, unauthenticated attacker can submit a forged token containing arbitrary identity claims to obtain a fully authenticated technician session. In some configurations, this may also allow bypass of multi-factor authentication. No user interaction is required.

CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weaknesses (CWE)

CWE-347

Threats tracking this CVE

• SimpleHelp Authentication Bypass via Forged OIDC Tokens (CVE-2026-48558) Actively Exploited, Added to CISA KEV — CRITICAL
• SimpleHelp RMM OIDC Authentication Bypass (CVE-2026-48558) — Unauthenticated Forged-Token Technician Account Creation and MFA Bypass — CRITICAL

References

• https://horizon3.ai/attack-research/disclosures/cve-2026-48558-simplehelp-authentication-bypass-iocs/
• https://simple-help.com/security/simplehelp-security-update-2026-05
• https://simple-help.com/release-news

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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.