CVE-2026-48558SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification
Updated under an hour ago ()
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It affects SimpleHelp and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jun 29, 2026; federal agencies had to remediate by Jul 2, 2026. Treat that date as your deadline.
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Free account, 1 product
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.
- CVSS
- 10.0 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-347
- Known exploited
- Added to CISA KEV Jun 29, 2026; federal remediation due Jul 2, 2026Apply 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.
- EPSS (exploitation in the next 30 days)
- 5.72% (percentile 93)
- Assigned by
- VulnCheck
- NVD analysis
- Analyzed
- Record last updated
- Oct 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
SimpleHelp SimpleHelp simplehelp:simplehelp (from the name) | from 5.5.0 before 5.5.16; 6.0 builds before 6.0 RC2 | CNA record |
simple-help simplehelp simple-help:simplehelp | before 5.5.16; 6.0 | NVD |
References
- https://horizon3.ai/attack-research/disclosures/cve-2026-48558-simplehelp-authentication-bypass-iocs/technical-description, exploit, third-party-advisory
- https://simple-help.com/security/simplehelp-security-update-2026-05vendor-advisory, patch
- https://simple-help.com/release-newsrelease-notes
- https://blackpointcyber.com/blog/a-djinn-in-the-machine-taskweavers-node-js-intrusion-chain/technical-description, third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-48558us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.