Unauthenticated technician access via unsigned OIDC tokens
Published Jun 12, 2026 · Updated Jun 12, 2026
Authentication bypass in SimpleHelp 5.5.15 and earlier and 6.0 pre-release versions allows remote attackers to obtain technician access. The OIDC login flow accepts identity tokens without verifying their cryptographic signatures, so forged claims register and authenticate a new technician. Exploitation requires OIDC, a linked TechnicianGroup, and group-authenticated logins; the resulting session can reach managed endpoints, run scripts, and enroll an attacker-controlled MFA method.
Summary
What happened
Authentication bypass in SimpleHelp 5.5.15 and earlier and 6.0 pre-release versions allows remote attackers to obtain technician access. The OIDC login flow accepts identity tokens without verifying their cryptographic signatures, so forged claims register and authenticate a new technician. Exploitation requires OIDC, a linked TechnicianGroup, and group-authenticated logins; the resulting session can reach managed endpoints, run scripts, and enroll an attacker-controlled MFA method.
The record
- CVE
- CVE-2026-48558
- Published
- Jun 12, 2026
- Updated
- Jun 12, 2026
- Vendor
- SimpleHelp
- Product
- SimpleHelp
- Classifications
- CWE-347, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 12, 2026CVE publishedPublication date reported by the CVE source.
- Jun 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=5.5.0 <5.5.16
- Affected versionversion=6.0 <6.0 RC2
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Reported exploitation
- CISA Known Exploited Vulnerabilities Catalog listingknown exploited catalog
Technologies
Your stack
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Your stack
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