Vulnerability · Published Aug 14, 2026 · Assigned by GitHub_M

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

None 0.0

In plain English

A open redirect in concourse from concourse. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)0.0None

Exploit odds (30 days)0.5%top 55.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/concourse/concourse	1.6.1-0.20260526150512-ac60be5f0435	GHSA-8w27-c4vc-88q9
Go	github.com/concourse/concourse	1.6.1-0.20260526150512-ac60be5f0435	GO-2026-5866

Affected products (as reported)

Vendor	Product	Versions
concourse	concourse	< 8.2.3

Weakness: CWE-601 · 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

References

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