---
id: CVE-2026-49820
title: >-
  Probo is a self-hostable governance, risk, and compliance (GRC) platform built
  for engineering and security teams
summary: >-
  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,
  OAu…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N'
cwe:
  - CWE-601
vendor: probo
product: go.probo.inc/probo
affected:
  - go.probo.inc/probo < 0.204.0
patched:
  - go.probo.inc/probo 0.204.0
published: '2026-08-13'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-49820'
references:
  - url: 'https://github.com/getprobo/probo/blob/main/SECURITY_NOTES.md'
    label: security-advisories@github.com
  - url: 'https://github.com/getprobo/probo/security/advisories/GHSA-x7qq-m748-8p2c'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-x7qq-m748-8p2c'
tags:
  - nvd
  - ghsa
  - go
epss: 0.00417
epssPercentile: 0.33271
ecosystem: go
ingestedAt: '2026-06-30T21:24:14.402Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-49820)

Affected packages:

- `go.probo.inc/probo < 0.204.0`

Patched in:

- `go.probo.inc/probo 0.204.0`

Source: https://github.com/advisories/GHSA-x7qq-m748-8p2c