CASCACascade Atlas

Evidence dossier

CVE-2026-48558

SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification

65.9–82.2Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Jun 12, 2026
Updated
Jul 14, 2026
Evidence coverage
85%
CISA KEVCatalog member

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.

FIRST EPSS1.16%

2026-07-18 · v2026.06.15 · percentile 63.6%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

VulnCheckoriginal assertion
container

SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification

CISA KEVoriginal assertion
observed_exploitation

SimpleHelp Authentication Bypass Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.011600000000; percentile 0.635750000000

Applicability

Cited product scope

Trace impact →
SimpleHelpSimpleHelp
[{"status": "affected", "version": "5.5.0", "lessThan": "5.5.16", "versionType": "semver"}, {"status": "affected", "version": "6.0", "lessThan": "6.0 RC2", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:simple-help:simplehelp:*:*:*:*:*:*:*:*; end excluding 5.5.16supported
Unknown vendorUnknown product
cpe:2.3:a:simple-help:simplehelp:6.0:pre-release:*:*:*:*:*:*supported

Assessments

CVSS by origin

9.5
disclosure@vulncheck.comCVSS 4.0 · role SecondaryCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
10.0
disclosure@vulncheck.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
9.5
VulnCheckCVSS 4.0 · role unknownCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
10.0
VulnCheckCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.