Vulnerability in Simple-help Simplehelp
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 w…
EPSS: 0.115 (95.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Simple-help Simplehelp — versions 6.0
- Simplehelp — versions 5.5.0, 6.0
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: 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.
Public proof-of-concept exploits
References
- disclosure@vulncheck.com (technical-description, Third Party Advisory, exploit)
- disclosure@vulncheck.com (release-notes, Release Notes)
- disclosure@vulncheck.com (vendor-advisory, Patch, Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Technical Description, Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2026-48558?
- CVE-2026-48558 is a critical-severity vulnerability in Simple-help Simplehelp, classified under Improper Verification of Cryptographic Signature. CVSS score: 10.0/10. Published 2026-06-12.
- How severe is CVE-2026-48558?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2026-48558 known to be exploited?
- Yes. CVE-2026-48558 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-29), indicating it is being actively exploited. 1 public proof-of-concept repositories are indexed.