CVE-2026-48558 (GCVE-0-2026-48558)
Vulnerability from cvelistv5 – Published: 2026-06-12 17:07 – Updated: 2026-10-07 19:26
VLAI
EPSS
VEX
Title
SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification
Summary
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.
Severity
10 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-30 03:55 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
VulnCheck
CNA
References
5 references
| URL | Tags |
|---|---|
| https://horizon3.ai/attack-research/disclosures/c… | technical-descriptionexploit |
| https://simple-help.com/security/simplehelp-secur… | vendor-advisory |
| https://simple-help.com/release-news | release-notes |
| https://blackpointcyber.com/blog/a-djinn-in-the-m… | third-party-advisory |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SimpleHelp | SimpleHelp |
Affected:
5.5.0 , < 5.5.16
(semver)
Affected: 6.0 , < 6.0 RC2 (custom) cpe:2.3:a:simple-help:simplehelp:*:*:*:*:*:*:*:* cpe:2.3:a:simple-help:simplehelp:*:*:*:*:*:*:*:* |
Date Public
2026-05-26 00:00
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