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CVE-2026-49820— Probo has an open redirect bypass via path normalization

Quick assessment

Affected
getprobo probo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Probo是Probo组织的一款网络探测工具。 Probo 0.193.1之前版本存在输入验证错误漏洞，该漏洞源于saferedirect包对重定向URL验证不充分，仅检查相对路径的第二个字符，导致经Go http.Redirect规范化后反斜杠可被浏览器解释为主机分隔符，绕过同源限制，可能造成开放重定向钓鱼攻击。

CVSS 4.7 · Medium EPSS 0.42% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
getprobo probo < 0.193.1 affected
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I. Basic Information for CVE-2026-49820

Vulnerability Information
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Vulnerability Title
Probo has an open redirect bypass via path normalization
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Probo 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Probo是Probo组织的一款网络探测工具。 Probo 0.193.1之前版本存在输入验证错误漏洞，该漏洞源于saferedirect包对重定向URL验证不充分，仅检查相对路径的第二个字符，导致经Go http.Redirect规范化后反斜杠可被浏览器解释为主机分隔符，绕过同源限制，可能造成开放重定向钓鱼攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
getprobo probo < 0.193.1 -

II. Public POCs for CVE-2026-49820

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III. Intelligence Information for CVE-2026-49820

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Vendor Advisories for CVE-2026-49820 (1)

Other References for CVE-2026-49820 (1)

IV. Related Vulnerabilities

Same product: probo
Same vendor: getprobo
Same weakness: CWE-601