--- title: "CVE-2026-48558: SimpleHelp Authentication Bypass… | CubePath" description: "SimpleHelp versions 5.5.15 and prior and 6.0 pre-release versions contain an authentication bypass vulnerability in the OIDC authentication flow…" language: en source: https://cubepath.com/security/cve/CVE-2026-48558 --- # CVE-2026-48558: SimpleHelp Authentication Bypass… | CubePath ## Description 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. Official description from the CVE record, published by VulnCheck. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-48558) ## Key data ### CVSS 4.0 Critical 9.5 Score published by VulnCheck in the CVE record. 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 | Metric | Value | What it means | | ----------------------------------- | ------- | --------------------------------------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No measurable action is needed to get around the system's built-in security controls. The attack is repeatable. | | Attack requirements | Present | The attack depends on certain deployment or execution conditions being present. | | Privileges required | None | No account or privileges are needed. | | User interaction | None | No action from any user is needed. | | Vulnerable system: confidentiality | High | Serious or total effect on the secrecy of data. | | Vulnerable system: integrity | High | Serious or total effect on the trustworthiness of data. | | Vulnerable system: availability | High | Serious or total effect on availability. | | Subsequent systems: confidentiality | High | Serious or total effect on other systems' data secrecy. | | Subsequent systems: integrity | High | Serious or total effect on other systems' data trustworthiness. | | Subsequent systems: availability | High | Serious or total effect on other systems' availability. | ### CVSS 3.1 Critical 10.0 Score published by VulnCheck in the CVE record. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H | Metric | Value | What it means | | ---------------------- | ------- | ----------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. | | Privileges required | None | No account or privileges are needed. | | User interaction | None | No action from any user is needed. | | Scope | Changed | The impact can reach other components beyond the vulnerable one. | | Confidentiality impact | High | Serious or total effect on the secrecy of data. | | Integrity impact | High | Serious or total effect on the trustworthiness of data. | | Availability impact | High | Serious or total effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.80251 (80.3% probability) Percentile 99.6% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog SimpleHelp Authentication Bypass Vulnerability Added to the catalog Jun 29, 2026 Federal due date Jul 2, 2026 ### CISA assessment as of Jun 30, 2026 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable yes Technical impact total ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-347](https://cwe.mitre.org/data/definitions/347.html) Improper Verification of Cryptographic Signature ## Affected products Products listed in the CVE record, as the CNA published them. - SimpleHelp - affected: 5.5.0 up to before 5.5.16 - affected: 6.0 up to before 6.0 RC2 ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [horizon3.ai/attack-research/disclosures/cve-2026-48558-simp…](https://horizon3.ai/attack-research/disclosures/cve-2026-48558-simplehelp-authentication-bypass-iocs/) technical-description exploit - [simple-help.com/security/simplehelp-security-update-2026-05](https://simple-help.com/security/simplehelp-security-update-2026-05) vendor-advisory - [simple-help.com/release-news](https://simple-help.com/release-news) release-notes ## Timeline 1. ID reserved May 21, 2026 2. Record published Jun 12, 2026 3. Added to CISA KEV Jun 29, 2026 4. Record last updated Oct 7, 2026 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:11 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)