CVE-2026-49826: Concourse login flow has an open redirect issue

Severity: none (CVSS 0.0 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-14 · updated 2026-09-18
Weakness: CWE-601

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.

Affected products

concourse: before 8.2.3

References

https://github.com/concourse/concourse/commit/ac60be5f0435b6592f5a4fcc089050d72ad2452c
https://github.com/concourse/concourse/releases/tag/v8.2.3
https://github.com/concourse/concourse/security/advisories/GHSA-8w27-c4vc-88q9

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