---
id: "CVE-2022-51026"
kind: "vulnerability"
aliases: ["CVE-2022-51026"]
title: "Bytebase: GitLab login trusts client URL, letting attackers log in as anyone"
severity: "critical"
cvss: 9.8
epss: 0.00613
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["bytebase", "gitlab", "package", "self-hosted"]
not_affected_if: ["default-config", "managed-hosting"]
published_at: "2026-10-22T19:17:30+00:00"
first_seen_at: "2026-10-23T21:57:31+00:00"
updated_at: "2026-10-24T07:15:51+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-51026", "first_seen_at": "2026-10-23T21:57:31+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2022-51026", "first_seen_at": "2026-10-24T07:15:51+00:00"}]
---

# Bytebase: GitLab login trusts client URL, letting attackers log in as anyone

Bytebase versions 0.12.0 before 1.0.1 accept a client-supplied GitLab instance URL on the self-hosted GitLab login endpoint. An unauthenticated attacker can point that URL at their own server, claim any user's email, and receive a session as that user, including the Owner.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

Check the Bytebase version; a version from 0.12.0 up to but not including 1.0.1 is affected. Review logs for POST requests to /api/auth/login/GITLAB_SELF_HOST from unknown sources.

## Fix

Upgrade Bytebase to 1.0.1 or later. Rotate session tokens and review member and Owner accounts for unexpected changes if the instance was exposed.

## Timeline

- 2026-10-23T21:57:31+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2022-51026
- 2026-10-24T07:15:51+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2022-51026

## From the sources

Bytebase 0.12.0 before 1.0.1 contains an authentication bypass vulnerability that allows unauthenticated attackers to log in as any user. The flaw stems from trusting client-supplied GitLab provider configuration in the POST /api/auth/login/GITLAB_SELF_HOST endpoint. Attackers can set instanceUrl to a server they control that returns an active user with a chosen email. Bytebase then issues session tokens for that principal, letting attackers impersonate existing users including the Owner or create new members.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_