{"id":"GHSA-c83f-3xp6-hfcp","summary":"Saloon is vulnerable to SSRF and credential leakage via absolute URL in endpoint overriding base URL","details":"### Impact\nUsers providing user generated input into the `resolveEndpoint` method on requests.\n\n### Patches\nUpgrade to Saloon v4+\n\nUpgrade guide: https://docs.saloon.dev/upgrade/upgrading-from-v3-to-v4\n\n### Description\nWhen building the request URL, Saloon combined the connector's base URL with the request endpoint. If the endpoint was a valid absolute URL (e.g. https://attacker.example.com/callback), 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 the next major version) 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.\n\n### Credits\nSaloon thanks @HuajiHD for finding the issue and recommending solutions and @JonPurvis for applying the fix.","aliases":["CVE-2026-33182"],"modified":"2026-03-30T14:05:00.382847Z","published":"2026-03-25T22:00:13Z","database_specific":{"github_reviewed_at":"2026-03-25T22:00:13Z","nvd_published_at":"2026-03-26T01:16:27Z","cwe_ids":["CWE-522","CWE-918"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/saloonphp/saloon/security/advisories/GHSA-c83f-3xp6-hfcp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33182"},{"type":"WEB","url":"https://docs.saloon.dev/upgrade/upgrading-from-v3-to-v4"},{"type":"PACKAGE","url":"https://github.com/saloonphp/saloon"}],"affected":[{"package":{"name":"saloonphp/saloon","ecosystem":"Packagist","purl":"pkg:composer/saloonphp/saloon"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.0.0"}]}],"versions":["v0.0.2","v0.0.3","v0.0.4","v0.1.0","v0.10.0","v0.11.0","v0.2.0","v0.3.0","v0.3.1","v0.4.0","v0.4.1","v0.5.0","v0.6.0","v0.6.1","v0.6.2","v0.6.3","v0.6.4","v0.6.5","v0.6.6","v0.7.0","v0.7.1","v0.7.2","v0.8.0","v0.8.1","v0.8.2","v0.8.3","v0.9.0","v0.9.1","v0.9.2","v1.0","v1.0.1","v1.1.0","v1.2.0","v1.3.0","v1.3.1","v1.3.2","v1.3.3","v1.4.0","v1.4.1","v1.4.2","v1.4.3","v1.4.4","v1.5","v1.5.1","v1.5.2","v1.5.3","v1.6.0","v1.6.1","v1.6.2","v1.7.0","v1.7.1","v2.0.0","v2.0.0-beta1","v2.0.0-beta2","v2.0.0-beta3","v2.0.0-beta4","v2.0.0-beta5","v2.0.0-beta6","v2.0.0-beta7","v2.0.1","v2.0.2","v2.1.0","v2.10.0","v2.11.0","v2.12.0","v2.12.1","v2.2.0","v2.3.0","v2.4.0","v2.5.0","v2.6.0","v2.6.1","v2.6.2","v2.6.3","v2.6.4","v2.6.5","v2.6.6","v2.7.0","v2.8.0","v2.8.1","v2.9.0","v2.9.1","v2.9.2","v3.0.0","v3.0.0-beta.1","v3.0.0-beta.2","v3.0.0-beta.3","v3.0.0-beta.4","v3.0.0-beta.5","v3.0.0-beta.6","v3.0.0-beta.7","v3.0.1","v3.0.2","v3.0.3","v3.0.4","v3.0.5","v3.0.6","v3.1.0","v3.10.0","v3.10.1","v3.11.0","v3.11.1","v3.11.2","v3.12.0","v3.13.0","v3.13.1","v3.14.0","v3.14.1","v3.14.2","v3.14.3","v3.15.0","v3.2.0","v3.3.0","v3.3.1","v3.3.2","v3.4.0","v3.4.1","v3.4.2","v3.5.0","v3.6.0","v3.6.1","v3.6.2","v3.6.3","v3.6.4","v3.7.0","v3.8.0","v3.8.1","v3.9.0","v3.9.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-c83f-3xp6-hfcp/GHSA-c83f-3xp6-hfcp.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}