Vulnerability · Published Mar 26, 2026 · Assigned by GitHub_M
CVE-2026-33182Saloon is vulnerable to SSRF and credential leakage via absolute URL in endpoint overriding base URL
Medium 6.6
In plain English
A medium-severity server-side request forgery in saloon from saloonphp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | saloonphp/saloon | 4.0.0 | GHSA-c83f-3xp6-hfcp |
Affected products (as reported)
Weakness: CWE-918, CWE-522 · 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
References
- https://github.com/saloonphp/saloon/security/advisories/GHSA-c83f-3xp6-hfcp x_refsource_CONFIRM
- https://docs.saloon.dev/upgrade/upgrading-from-v3-to-v4 x_refsource_MISC