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Back to active CVEs
Critical · CVSS 9.5Known ExploitedCVE-2026-48558

SimpleHelp Authentication Bypass via Missing OIDC JWT Signature VerificationCVE-2026-48558

Answer in brief

CVE-2026-48558 records a Critical severity (CVSS 9.5) vulnerability in SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification. The current sources mark it as known exploited. The current feed maps SimpleHelp/SimpleHelp (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 12, 2026Updated Oct 7, 2026Source checked Oct 7, 2026First seen by HOL Jun 29, 2026Material review Oct 7, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.5
Exploitation
Known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 9.5. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps SimpleHelp/SimpleHelp (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
SimpleHelp/SimpleHelpgeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for SimpleHelp/SimpleHelp.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Jun 12, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jun 29, 2026

  4. Added to CISA KEV

    Jun 29, 2026

    Evidence: source:kev:kev:kev:record

Sources and claim methodology

  • Source referenceblackpointcyber.com
  • Source referencehorizon3.ai
  • Source referencesimple-help.com
  • Source referencesimple-help.com
  • CISA Known Exploited Vulnerabilities catalogcisa.gov
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Apache Geode: Management REST API: Insertion of Sensitive Information into Log FileSame generic ecosystem
  • Gimp: gimp: heap buffer overflow in pcx export on oversized image dimensionsSame generic ecosystem
  • Gimp: gimp: heap buffer overflow in raw data export on oversized image dimensionsSame generic ecosystem
  • Gimp: gimp: heap buffer overflow in hot color filter on oversized imageSame generic ecosystem
  • Infinite Loop in Telerik Document Processing XLS ImportSame generic ecosystem
  • Backstage: Improper input validation in TechDocs Markdown extension configurationSame generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-347
Source
CVE List V5
Source checked
Oct 7, 2026
References
5 linked sources
Open source record