Studio-Saelix Sencho up to 0.94.1 Login Endpoint /api/auth/login X-Forwarded-For improper authentication

Summaryinfo

A vulnerability labeled as critical has been found in Studio-Saelix Sencho up to 0.94.1. This vulnerability affects unknown code of the file /api/auth/login of the component Login Endpoint. Executing a manipulation of the argument X-Forwarded-For can lead to improper authentication. This vulnerability appears as CVE-2026-108522. The attack may be performed from remote. In addition, an exploit is available. It is advisable to implement a patch to correct this issue. The vendor confirms: "The login limiter relied on client-supplied X-Forwarded-For data without an explicit trusted-proxy boundary, allowing an attacker to rotate the apparent client address. The remediation now ignores forwarding headers by default, accepts them only from explicitly configured proxy CIDRs, and adds a separate failed-attempt limit keyed by normalized account identity."

Detailsinfo

A vulnerability classified as critical was found in Studio-Saelix Sencho up to 0.94.1. This vulnerability affects an unknown part of the file /api/auth/login of the component Login Endpoint. The manipulation of the argument X-Forwarded-For with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability.

The advisory is shared for download at gist.github.com. This vulnerability was named CVE-2026-108522. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known.

It is possible to download the exploit at gist.github.com. It is declared as proof-of-concept. The vendor confirms: "The login limiter relied on client-supplied X-Forwarded-For data without an explicit trusted-proxy boundary, allowing an attacker to rotate the apparent client address. The remediation now ignores forwarding headers by default, accepts them only from explicitly configured proxy CIDRs, and adds a separate failed-attempt limit keyed by normalized account identity."

Applying the patch 79b86ddcd4aefdd6941f098e35990ab397b13c72 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-96729). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Studio-Saelix

Name

• Sencho

Version

• 0.94.0
• 0.94.1

License

• open-source

Website

• Product: https://github.com/Studio-Saelix/sencho/

CPE 2.3info

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CPE 2.2info

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Submitinfo

Accepted

• Submit #893366: Studio-Saelix sencho <= 0.94.1 Authentication Bypass by Spoofing (by jpazz)

Once again VulDB remains the best source for vulnerability data.

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