saloonphp saloon up to 3.x Request Endpoint URLHelper::join server-side request forgery

Summaryinfo

A vulnerability described as critical has been identified in saloonphp saloon up to 3.x. This affects the function URLHelper::join of the component Request Endpoint. The manipulation results in server-side request forgery. This vulnerability is identified as CVE-2026-33182. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in saloonphp saloon up to 3.x. It has been classified as critical. Affected is the function URLHelper::join of the component Request Endpoint. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Saloon is a PHP library that gives users tools to build API integrations and SDKs. Prior to version 4.0.0, when building the request URL, Saloon combined the connector's base URL with the request endpoint. If the endpoint was a valid absolute URL, the code used that URL as-is and ignored the base URL. The request—and any authentication headers, cookies, or tokens attached by the connector—was then sent to the attacker-controlled host. If the endpoint could be influenced by user input or configuration (e.g. redirect_uri, callback URL), this allowed server-side request forgery (SSRF) and/or credential leakage to a third-party host. The fix in version 4.0.0 is to reject absolute URLs in the endpoint: URLHelper::join() throws InvalidArgumentException when the endpoint is a valid absolute URL, unless explicitly allowed, requiring callers to opt-in to the functionality on a per-connector or per-request basis.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-33182 since 03/17/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

Upgrading to version 4.0.0 eliminates this vulnerability.

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Productinfo

Vendor

• saloonphp

Name

• saloon

Version

• 3.x

Website

• Product: https://github.com/saloonphp/saloon/

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