CVE-2026-49826
Received Received - Intake

Open Redirect Vulnerability in Concourse CI/CD

Publication date: 2026-08-14

Last updated on: 2026-08-14

Assigner: GitHub, Inc.

Description
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.

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Meta Information

Published
2026-08-14
Last Modified
2026-08-14
Generated
2026-08-14
AI Q&A
2026-08-14
EPSS Evaluated
N/A
NVD
CVE-2026-49826
EUVD
EUVD-2026-58716

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
concourse concourse to 8.2.3 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-601 The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.

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Executive Summary

CVE-2026-49826 is an open redirect vulnerability in Concourse, a container-based automation system. It allows attackers to craft URLs that redirect users from the Concourse web server to any external site after login. This could be used in phishing attacks to steal user credentials.

Detection Guidance

To detect this vulnerability, check if your Concourse instance is running a version prior to 8.2.3. Use the command: concourse --version. If the version is 8.2.2 or earlier, the system is vulnerable.

Impact Analysis

An attacker could trick you into clicking a malicious link that appears to come from Concourse. After logging in, you might be redirected to a fake site designed to steal your credentials or install malware. This affects users of Concourse versions 8.2.2 and earlier.

Mitigation Strategies

Upgrade Concourse to version 8.2.3 or later immediately. Download the latest release from the official Concourse repository and follow the upgrade instructions provided in the release notes.

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