CVE-2026-49820
MediumCVSS 4.7Exploitation Probability (EPSS)
Low risk36th percentile - higher than 36% of all known CVEs
Summary
In Probo, the `saferedirect` package improperly validated redirect URLs by only inspecting the second character of relative paths. A URL like `/../\evil.com` passed validation, and browsers could interpret the backslash as a host separator, redirecting users to an external domain. This enables open-redirect phishing attacks.
Risk Assessment
Risk of phishing and redirecting users to malicious sites, potentially leading to credential theft or malware installation.
Recommendation
Upgrade to probod v0.194.1 or later (for self-hosted) or use the patched SaaS version. No practical workaround is available for self-hosted installations.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS