CVE-2026-49826

Concourse login flow has an open redirect issue

Published Aug 14, 2026 CVSS 4.0 · 0 Low EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-8w27-c4vc-88q9 Concourse login flow has an open redirect issue
History
Type Values Removed Values Added
First Time appeared Concourse
Concourse concourse
Vendors & Products Concourse
Concourse concourse
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Concourse login flow has an open redirect issue
Weaknesses CWE-601
References
Metrics cvssV4_0

{'score': 0, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Aug 14, 2026, 6:06 PM
Reserved
Jun 1, 2026, 6:50 PM
Status
Awaiting Analysis
Published
Aug 14, 2026, 5:18 PM
Modified
Sep 18, 2026, 8:05 PM