CVE-2026-48558

9.5 CRITICAL 81% exploit odds Drop everything exploited in the wild Fix listed Crypto Web app

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
In the wild: CISA lists this as exploited in real attacks. Treat as urgent.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-05-21 18:34 UTC ReservedThe CVE id was reserved by its CNA
2026-06-12 18:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-29 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
2026-07-02 Remediation deadlineCISA's due date for federal agencies to fix it
2026-10-07 20:17 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
Exploit odds: 80.8% in the next 30 days (EPSS).
Severity: 9.5 CRITICAL (CVSS).
Fix: a patch or advisory is linked.
It meets the bar for Drop everything: critical, and exploited or very likely to be.

Details

Published: 2026-06-12 18:16 UTC
Last modified: 2026-10-07 20:17 UTC
Added to CISA KEV: 2026-06-29
Exploit probability: 80.8% · EPSS, next 30 days
Weakness: CWE-347
Record status: Analyzed

Affected

simple-help Simplehelp < 5.5.16
simple-help Simplehelp 6.0

Attack profile CVSS 4.0 · 9.5

Attack vector: Network
Complexity: Low
Attack requirements: Present
Privileges needed: None
User interaction: None
Confidentiality: High
Integrity: High
Availability: High

Raw vector

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/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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-48558.md and follow it. Check whether this project is affected by CVE-2026-48558. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

https://simple-help.com/security/simplehelp-security-update-2026-05

References

NVD record · CVE.org record