CVE-2026-48558
Act now ● On CISA KEV — actively exploited
Actively exploited — on the CISA KEV list.
CVSS base
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EPSS — probability of exploitation (30 days)
64.3%
99.2th percentile
CISA KEV
Listed
Added 2026-06-29 · patch by 2026-07-02
Weakness / dates
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Published — · modified —
Timeline
- 2026-06-29 — Added to CISA KEV (actively exploited)
- 2026-07-02 — CISA patch-by deadline
Description
SimpleHelp contains 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.