CVE-2026-48558

CVE-2026-48558 is a critical-severity vulnerability in Simple-help Simplehelp with a CVSS 3.x base score of 10.0. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-06-29). The underlying weakness is classified as CWE-347.

Key facts

Description

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.

Frequently asked questions

What is CVE-2026-48558?
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.
How severe is CVE-2026-48558?
CVE-2026-48558 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-48558 being actively exploited?
Yes. CVE-2026-48558 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-06-29, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-48558?
CVE-2026-48558 primarily affects Simple-help Simplehelp. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-48558?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2026-48558 have an EU (EUVD) identifier?
Yes. CVE-2026-48558 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36509.
When was CVE-2026-48558 published?
CVE-2026-48558 was published on 2026-06-12 and last updated on 2026-06-30.

References

Affected products (2)

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