CVE-2026-48558SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification
Explotación conocida — SimpleHelp Authentication Bypass Vulnerability
CISA confirmó el 29.06.2026 que esta vulnerabilidad se usa en ataques reales. Plazo para las agencias federales de EE. UU.: 02.07.2026.
Acción requerida: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. https://simple-help.com/security/simplehelp-security-update-2026-05 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-48558
Descripción
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.
Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.
Productos y versiones afectados
| Fabricante | Producto | Versiones | |
|---|---|---|---|
| simple-help | simplehelp | 5.5.0 – < 5.5.16 | |
| SimpleHelp | SimpleHelp | 5.5.0 – < 5.5.16, 6.0 – < 6.0 RC2 |
Referencias y parches
- https://horizon3.ai/attack-research/disclosures/cve-2026-48558-simplehelp-authentication-bypass-iocs/ technical-descriptionexploitThird Party Advisory
- https://simple-help.com/security/simplehelp-security-update-2026-05 vendor-advisoryPatchVendor Advisory
- https://simple-help.com/release-news release-notesRelease Notes
- https://blackpointcyber.com/blog/a-djinn-in-the-machine-taskweavers-node-js-intrusion-chain/ Technical DescriptionThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-48558 US Government Resource
Coincidencias CPE (NVD) (2)
cpe:2.3:a:simple-help:simplehelp:*:*:*:*:*:*:*:*< 5.5.16cpe:2.3:a:simple-help:simplehelp:6.0:pre-release:*:*:*:*:*:*