CVE-2026-48558 (GCVE-0-2026-48558)
Vulnerability from cvelistv5 – Published: 2026-06-12 17:07 – Updated: 2026-07-14 21:33Title
SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification
Summary
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.
Severity
10 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-12 00:00 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://horizon3.ai/attack-research/disclosures/c… | technical-descriptionexploit |
| https://simple-help.com/security/simplehelp-secur… | vendor-advisory |
| https://simple-help.com/release-news | release-notes |
| https://blackpointcyber.com/blog/a-djinn-in-the-m… | third-party-advisory |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| SimpleHelp | SimpleHelp |
Affected:
5.5.0 , < 5.5.16
(semver)
Affected: 6.0 , < 6.0 RC2 (custom) cpe:2.3:a:simple-help:simplehelp:*:*:*:*:*:*:*:* cpe:2.3:a:simple-help:simplehelp:*:*:*:*:*:*:*:* |
Date Public
2026-05-26 00:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 167a80d5-696a-4662-b00a-01aae647fbd4
Exploited: Yes
Timestamps
First Seen: 2026-06-29
Asserted: 2026-06-29
Scope
Notes: KEV entry: SimpleHelp Authentication Bypass Vulnerability | Affected: SimpleHelp / SimpleHelp | Description: SimpleHelp contains 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. | 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. | Due date: 2026-07-02 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-347 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | SimpleHelp |
| Due Date | 2026-07-02 |
| Date Added | 2026-06-29 |
| Vendorproject | SimpleHelp |
| Vulnerabilityname | SimpleHelp Authentication Bypass Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-06-29 20:00 UTC
| Updated: 2026-06-29 20:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 885e6fd4-e620-46f3-85eb-794dd7c822e6
Exploited: Yes
Timestamps
First Seen: 2026-06-29
Asserted: 2026-06-29
Scope
Notes: KEVIntel entry: SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification | Affected: SimpleHelp / SimpleHelp | CVSS: 9.5 (CRITICAL) | EPSS: 0.00721 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification |
| Vendor | SimpleHelp |
| Product | SimpleHelp |
| Added Date | 2026-06-29T14:20:22.145Z |
| Cvss Score | 9.5 |
| Epss Score | 0.00721 |
| Cvss Severity | CRITICAL |
| Epss Percentile | 0.49308 |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | True |
References
Created: 2026-06-29 15:00 UTC
| Updated: 2026-06-29 15:00 UTC
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"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
},
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 10,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-347",
"description": "Improper Verification of Cryptographic Signature",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-14T21:33:11.205Z",
"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"shortName": "VulnCheck"
},
"references": [
{
"tags": [
"technical-description",
"exploit"
],
"url": "https://horizon3.ai/attack-research/disclosures/cve-2026-48558-simplehelp-authentication-bypass-iocs/"
},
{
"tags": [
"vendor-advisory"
],
"url": "https://simple-help.com/security/simplehelp-security-update-2026-05"
},
{
"tags": [
"release-notes"
],
"url": "https://simple-help.com/release-news"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification",
"x_generator": {
"engine": "vulncheck"
}
}
},
"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"assignerShortName": "VulnCheck",
"cveId": "CVE-2026-48558",
"datePublished": "2026-06-12T17:07:05.453Z",
"dateReserved": "2026-05-21T18:34:46.418Z",
"dateUpdated": "2026-07-14T21:33:11.205Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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