Key points
- The vulnerability is tracked as CVE-2026-113703 and rated critical by the NVD.
- It affects all versions of SuggestArr released before version 3.0.0.
- The source material does not confirm the availability of a patch or update.
SuggestArr installations running any version prior to 3.0.0 are affected by a critical authentication bypass vulnerability. The National Vulnerability Database assigns CVE-2026-113703 to this issue, rating it at 9.1. This flaw allows attackers to gain administrative access without providing valid login credentials. Users must verify their current version immediately to determine if they are exposed to this risk.
In plain English
The software incorrectly trusts information sent by users about their own location. Specifically, the system relies on the X-Forwarded-For header to determine if a request comes from a trusted internal address. Because this header can be easily faked by an attacker, the system is misled into believing the request is legitimate. This allows unauthorized users to bypass security checks entirely and access sensitive administrative functions.
The background
The vulnerability exists in the local_bypass authentication mode of SuggestArr. The middleware component trusts the remote address value derived from client-controlled headers. This behavior is caused by a ProxyFix configuration that processes the X-Forwarded-For field. Attackers can set this header to a trusted address like 127.0.0.1. This tricks the system into loading an admin session context without verifying actual user credentials.
What changes now
Attackers can exploit this flaw to access sensitive endpoints such as user management and job controls. The vulnerability grants full administrative privileges to anyone who can send a crafted request. The source material does not state that a fix or update exists. Users must monitor official channels for updates while implementing temporary protective measures to limit exposure to untrusted network traffic.
Who needs to act first
Teams usually prioritize systems exposed to the internet for immediate review. Check whether your SuggestArr instance is accessible from public networks or only internal ones. Reduce exposure by restricting access to trusted IP ranges at the network level. Back up configuration files before making any changes to firewall rules or access controls. Test changes in a non-production environment first to ensure business operations continue smoothly during this temporary mitigation period.
What to do and how to stay safe: SuggestArr
- Verify the installed version of SuggestArr and confirm if it is before 3.0.0.
- Restrict access to the application server to trusted internal IP addresses only.
- Monitor server logs for unusual requests containing spoofed X-Forwarded-For headers.
- Wait for an official vendor update before applying any unverified code changes.
Step-by-step guide: Out-of-Band Patches: Meaning, Risks, and Deployment Reality
General security guidance from the Patch Herald newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is the CVE ID for this SuggestArr vulnerability?
The vulnerability is tracked as CVE-2026-113703 in the National Vulnerability Database.
How severe is the authentication bypass in SuggestArr?
The NVD rates the issue as critical with a CVSS score of 9.1.
Which versions of SuggestArr are affected by this flaw?
All versions of SuggestArr released before version 3.0.0 are affected.
