{"id":"GHSA-x7qq-m748-8p2c","summary":"Probo has an open redirect bypass via path normalization","details":"### Impact\nProbo's `saferedirect` package validates redirect URLs used across authentication flows (OIDC, SAML, session transfer, OAuth connectors, and trust-center magic links). The validator only inspected the second character of relative paths, so a URL like `/../\\evil.com` passed validation because the second character is `.`. Go's `http.Redirect` normalizes this path to `/\\evil.com` before setting the `Location` header. Browsers can interpret the backslash as a host separator and redirect the user to an external domain (`https://evil.com`), bypassing the intended same-origin restriction. This enables open-redirect phishing: an attacker can craft a `continue` parameter (or embed a malicious URL in a session-transfer token) that appears to originate from a trusted Probo domain but redirects victims elsewhere.\n\n### Patches\nFixed in `go.probo.inc/probo` by normalizing relative paths with `path.Clean` before validation, rejecting backslashes (including\npercent-encoded `%5c`) anywhere in the path, and re-checking the normalized result for protocol-relative and backslash prefixes.\n\nSelf-hosted deployments should upgrade to **probod v0.194.1** or later.\n\nSaaS deployments on getprobo.com are patched.\n\n### Workarounds\nNo practical workaround for self-hosted installations. Upgrade to the patched release.","aliases":["CVE-2026-49820","GO-2026-5861"],"modified":"2026-07-07T16:11:45.333381044Z","published":"2026-06-30T18:31:50Z","database_specific":{"cwe_ids":["CWE-601"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-06-30T18:31:50Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/getprobo/probo/security/advisories/GHSA-x7qq-m748-8p2c"},{"type":"PACKAGE","url":"https://github.com/getprobo/probo"},{"type":"WEB","url":"https://github.com/getprobo/probo/blob/main/SECURITY_NOTES.md"}],"affected":[{"package":{"name":"go.probo.inc/probo","ecosystem":"Go","purl":"pkg:golang/go.probo.inc/probo"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.204.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-x7qq-m748-8p2c/GHSA-x7qq-m748-8p2c.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N"}]}