CVE-2026-113703 giuseppe99barchetta CVE debrief

Who should care

Defenders responsible for SuggestArr deployments should assess exposure and prioritize patching to version 3.0.0 or later. Defenders should also review compensating controls for exposed systems while remediation is scheduled and verified. Additionally, defenders should confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Why it matters

CVE-2026-113703 is a critical authentication bypass vulnerability in SuggestArr before version 3.0.0. Defenders should prioritize patching to prevent unauthenticated admin session creation and potential full administrative access.

• Unauthenticated admin session creation
• Potential for full administrative access to endpoints
• Spoofing of X-Forwarded-For headers

Technical summary

The SuggestArr application before version 3.0.0 is vulnerable to an authentication bypass attack due to improper trust of client-controlled request.remote_addr value, which is derived from the spoofable X-Forwarded-For header. This allows attackers to send a request with X-Forwarded-For set to a trusted CIDR address, such as 127.0.0.1, to gain an unauthenticated admin session via _load_bypass_user_context(), gaining full administrative access to endpoints like /api/users and /api/jobs without providing any credentials.

Defensive priority

Defenders should prioritize patching SuggestArr to version 3.0.0 or later. In the meantime, consider implementing additional authentication mechanisms and validating X-Forwarded-For headers.

Recommended defensive actions

• Patch SuggestArr to version 3.0.0 or later
• Implement additional authentication mechanisms
• Validate X-Forwarded-For headers
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Review compensating controls for exposed systems while remediation is scheduled and verified.

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description, affected versions, and references to vendor advisories and patches. The SuggestArr application before version 3.0.0 is vulnerable to an authentication bypass attack due to improper trust of client-controlled request.remote_addr value, which is derived from the spoofable X-Forwarded-For header. Defenders should verify the affected scope and severity based on the official advisory or CVE record.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.