CVE-2026-48558 (GCVE-0-2026-48558)
Vulnerability from cvelistv5 – Published: 2026-06-12 17:07 – Updated: 2026-06-30 03:55Title
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 (v2.0.3)
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 | |
|---|---|---|---|
| SimpleHelp | SimpleHelp |
Affected:
5.5.0 , < 5.5.16
(semver)
Affected: 6.0 , < 6.0 RC2 (custom) |
Date Public
2026-05-26 00:00
Credits
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: cdbc909e-25e9-4715-8ddf-2a0998483dfc
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
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b3a20fd8-eebe-4a24-887e-3d9ad481e7d6
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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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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