🛡️ CVE-2026-49820 — probo

⚪ Unknown ✅ No Known Exploit CWE-601 OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Probo has an open redirect bypass via path normalization

Impact

Probo'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.

Patches

Fixed in go.probo.inc/probo 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.

Workarounds

No practical workaround for self-hosted installations. Upgrade to the patched release.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality none, integrity low, availability none.

Weakness class

CVE-2026-49820 is classified as CWE-601: Open Redirect. A redirect target is taken from user input, so a trusted link can send the visitor to an attacker's site.

Affected software

CVE-2026-49820 is recorded against 1 package.

  • go.probo.inc/probo

Timeline and source

Published on 30 June 2026 and last revised on 7 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Package)
github.com (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
CWE CWE-601
Public Exploit ✅ No
Source OSV
Published 2026-06-30
Updated 2026-08-12
Modified 2026-07-07
Fix URL N/A

Affected Packages

Software From version Fixed in
go.probo.inc/probo — —

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