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.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-c83f-3xp6-hfcp Saloon is vulnerable to SSRF and credential leakage via absolute URL in endpoint overriding base URL
Fixes

Solution

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Workaround

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History

Thu, 26 Mar 2026 01:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Saloon is vulnerable to SSRF and credential leakage via absolute URL in endpoint overriding base URL
Weaknesses CWE-522
CWE-918
References
Metrics cvssV4_0

{'score': 6.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-26T00:27:58.139Z

Reserved: 2026-03-17T22:16:36.720Z

Link: CVE-2026-33182

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-26T01:16:27.043

Modified: 2026-03-26T01:16:27.043

Link: CVE-2026-33182

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses