---
id: CVE-2026-49826
title: Concourse is a container-based automation system written in Go
summary: >-
  Concourse is a container-based automation system written in Go. Prior to
  version 8.2.3, an attacker is able to craft and send a user a URL that will
  redirect the user from the Concourse web server to any other site. This could
  be used in…
severity: low
cwe:
  - CWE-601
vendor: concourse
product: github.com/concourse/concourse
affected:
  - github.com/concourse/concourse < 1.6.1-0.20260526150512-ac60be5f0435
patched:
  - github.com/concourse/concourse 1.6.1-0.20260526150512-ac60be5f0435
published: '2026-08-14'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:05:53.723'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-49826'
references:
  - url: >-
      https://github.com/concourse/concourse/commit/ac60be5f0435b6592f5a4fcc089050d72ad2452c
    label: security-advisories@github.com
  - url: 'https://github.com/concourse/concourse/releases/tag/v8.2.3'
    label: security-advisories@github.com
  - url: >-
      https://github.com/concourse/concourse/security/advisories/GHSA-8w27-c4vc-88q9
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-8w27-c4vc-88q9'
tags:
  - nvd
  - ghsa
  - go
epss: 0.00526
epssPercentile: 0.42082
ecosystem: go
ingestedAt: '2026-07-01T19:15:59.899Z'
---

## Overview

Concourse is a container-based automation system written in Go. Prior to version 8.2.3, an attacker is able to craft and send a user a URL that will redirect the user from the Concourse web server to any other site. This could be used in a phishing attack to steal user's credentials. This has been fixed in 8.2.3. No known workarounds are available.

## Remediation

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

## Package advisory (CVE-2026-49826)

Affected packages:

- `github.com/concourse/concourse < 1.6.1-0.20260526150512-ac60be5f0435`

Patched in:

- `github.com/concourse/concourse 1.6.1-0.20260526150512-ac60be5f0435`

Source: https://github.com/advisories/GHSA-8w27-c4vc-88q9