Is CVE-2026-48558 actively exploited?

Yes. KEV Intelligence tracks CVE-2026-48558 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2026-48558. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2026-48558 affects SimpleHelp SimpleHelp. Reported affected versions include 5.5.0 to < 5.5.16 and 6.0 to < 6.0 RC2.

Yes. CVE-2026-48558 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

CVE-2026-48558 Exploited in the Wild — SimpleHelp

Q: How should organizations remediate it?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Q: Is it in CISA KEV?

Yes. CVE-2026-48558 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-48558 is an unauthenticated vulnerability affecting SimpleHelp SimpleHelp. SimpleHelp versions 5.5.15 and prior and 6.0 pre-release versions contain an authentication bypass vulnerability in the OIDC...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

SimpleHelp / SimpleHelp affected before 5.5.16.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

SimpleHelp Authentication Bypass Authentication Bypass

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.

Vendor Product Affected Status

SimpleHelp SimpleHelp Before 5.5.16 Affected

SimpleHelp SimpleHelp Before 6.0 RC2 Affected

View vendor advisory

Published: 12 Jun 2026
Exploitation Reported: 29 Jun 2026
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: None

CVE References

Vendor Advisory — simple-help.com simple-help.com · Vendor Advisory https://simple-help.com/security/simplehelp-security-update-2026-05
Exploit — horizon3.ai horizon3.ai · Exploit https://horizon3.ai/attack-research/disclosures/cve-2026-48558-simple...
Release Notes — simple-help.com simple-help.com · Release Notes https://simple-help.com/release-news

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

BleepingComputer

Recorded 29 Jun 2026

Independent exploitation attestation added to the KEV Intelligence record.

Proof of concept available

GitHub

Recorded 02 Jul 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

Learn about Pro API access

Source	Added
CISA First	2026-06-29 00:00 UTC
BleepingComputer	2026-06-29 14:20 UTC
CVE	2026-06-29 20:20 UTC
All CISA Advisories	2026-06-29 21:20 UTC
TheHackerNews	2026-06-30 12:20 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 0
User-Agents: 0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

9.5 Critical

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

EPSS

11.5%

Weaknesses

Improper Verification of Cryptographic Signature CWE-347

Recent mention · TheHackerNews

Attackers Exploit SimpleHelp CVE-2026-48558 to Deploy TaskWeaver and Djinn Stealer

An unknown threat actor has been observed exploiting a recently disclosed maximum-severity security flaw in SimpleHelp to deliver two previously unreported malware families, TaskWeaver and Djinn Stealer. The intrusion involves the exploitation of CVE-2026-48558 (CVSS score:...

Read full advisory

All CVSS Scores

CVSS v4.0 9.5 Critical

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS v3.1 10.0 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

All Mentions

Recent mention · TheHackerNews

Attackers Exploit SimpleHelp CVE-2026-48558 to Deploy TaskWeaver and Djinn Stealer

TheHackerNews · 30 Jun 2026

An unknown threat actor has been observed exploiting a recently disclosed maximum-severity security flaw in SimpleHelp to deliver two previously unreported malware families, TaskWeaver and Djinn Stealer. The intrusion involves the exploitation of CVE-2026-48558 (CVSS score: 10.0), a critical authentication bypass vulnerability impacting the OpenID Connect (OIDC) flow that an unauthenticated

Recent mention · Dark Reading

'Djinn' Stealer Targets Cloud, AI Credentials

Dark Reading · 29 Jun 2026

The infostealer was delivered via CVE-2026-48558, a critical authentication bypass vulnerability in SimpleHelp, targeting credentials linking development and admin environments to wider enterprise systems.

Recent mention · BleepingComputer

Critical SimpleHelp flaw exploited to deploy new stealer malware

BleepingComputer · 29 Jun 2026

Hackers are exploiting a recently disclosed critical vulnerability (CVE-2026-48558) in SimpleHelp to deploy Djinn Stealer, a previously undocumented cross-platform information stealer targeting Windows, macOS, and Linux. [...]

Recent mention · All CISA Advisories

CISA Adds One Known Exploited Vulnerability to Catalog

All CISA Advisories · 29 Jun 2026

CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-48558 SimpleHelp Authentication Bypass Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires...

Recent mention · Horizon3.ai Attack Research

CVE-2026-48558: SimpleHelp Authentication Bypass Indicators of Compromise

Horizon3.ai Attack Research · 12 Jun 2026

Horizon3.ai details indicators of compromise, affected configurations, and mitigation guidance for CVE-2026-48558, a SimpleHelp OIDC authentication bypass vulnerability.

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

J4ck3LSyN-Gen2/CVE-2026-48558

github · Created 2026-07-02 16:11:50 UTC · 1 stars

SimpleHelp OIDC Authentication Bypass PoC

Timeline

From disclosure to observed exploitation

02 Jul 2026
Public PoC available

Public proof-of-concept code published
30 Jun 2026
KEV confirmed by TheHackerNews

Exploitation attested by an external source
29 Jun 2026
KEV confirmed by All CISA Advisories

Exploitation attested by an external source
29 Jun 2026
KEV confirmed by CVE

Exploitation attested by an external source
29 Jun 2026
KEV confirmed by BleepingComputer

Exploitation attested by an external source
29 Jun 2026
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
12 Jun 2026
CVE published

Vulnerability disclosed publicly
21 May 2026
CVE ID reserved

Identifier reserved by the CNA

Pro API

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Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-48558

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2026-48558",
  "confidence": "Confirmed",
  "cvss_score": 9.5,
  "epss_score": 0.11484,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

CVE-2026-48558

What security teams need to know first

SimpleHelp Authentication Bypass Authentication Bypass

Tags

CVE References

Why KEV Intelligence marks this CVE as exploited

Exploited in the wild

Proof of concept available

Known exploited vulnerability sources

Operational artifacts and observed signals

Observed signals

Scanner coverage

Virtual patch status

Severity, weaknesses, and research context

Weaknesses

Attackers Exploit SimpleHelp CVE-2026-48558 to Deploy TaskWeaver and Djinn Stealer

All CVSS Scores

All Mentions

Potential Proof of Concepts

From disclosure to observed exploitation

Public PoC available

KEV confirmed by TheHackerNews

KEV confirmed by All CISA Advisories

KEV confirmed by CVE

KEV confirmed by BleepingComputer

Added to CISA KEV

CVE published

CVE ID reserved

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