CVE-2026-48558: SimpleHelp Authentication Bypass Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.
CSIRTS triage
- What
- An authentication bypass vulnerability allows unauthenticated access to technician sessions.
- Who is affected
- Users of SimpleHelp with OIDC authentication configured are affected.
- Urgency
- Remediation is urgent due to active exploitation and critical severity.
- Action
- Update to the latest version of SimpleHelp.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-48558
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2026-48558Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 63% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-48558 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownexploitedSimpleHelp security advisory (AV26-642)cccs
- highexploitedCISA Adds One Known Exploited Vulnerability to Catalogcisa
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