CVE-2026-49820: getprobo probo, пренасочване към чужд адрес

Описание

Оригинално описание

Probo is a self-hostable governance, risk, and compliance (GRC) platform built for engineering and security teams. Probo's `saferedirect` package validates redirect URLs used across authentication flows (OIDC, SAML, session transfer, OAuth connectors, and trust-center magic links). Prior to version 0.19.3.1, 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. This is fixed in `go.probo.inc/probo` 0.193.1 by normalizing relative paths with `path.Clean` before validation, rejecting backslashes (including percent-encoded `%5c`) anywhere in the path, and re-checking the normalized result for protocol-relative and backslash prefixes. Self-hosted deployments should upgrade to probod v0.194.1 or later. SaaS deployments on getprobo.com are patched. No practical workaround is available for self-hosted installations.

Засегнати продукти

• getprobo probo: < 0.193.1

Вид слабост

• CWE-601 URL Redirection to Untrusted Site

История

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-49820
• https://nvd.nist.gov/vuln/detail/CVE-2026-49820
• https://github.com/getprobo/probo/security/advisories/GHSA-x7qq-m748-8p2c
• https://github.com/getprobo/probo/blob/main/SECURITY_NOTES.md