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

Quick assessment

Affected
concourse concourse
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Concourse是Concourse组织的一个用 Go 语言编写的基于容器的自动化系统。 Concourse 8.2.3之前版本存在输入验证错误漏洞，该漏洞源于URL重定向问题，可能导致用户被重定向到任意站点，遭受钓鱼攻击窃取用户凭据。

EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
concourse concourse < 8.2.3 affected
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I. Basic Information for CVE-2026-49826

Vulnerability Information
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Vulnerability Title
Concourse login flow has an open redirect issue
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Concourse 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Concourse是Concourse组织的一个用 Go 语言编写的基于容器的自动化系统。 Concourse 8.2.3之前版本存在输入验证错误漏洞，该漏洞源于URL重定向问题，可能导致用户被重定向到任意站点，遭受钓鱼攻击窃取用户凭据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
concourse concourse < 8.2.3 -

II. Public POCs for CVE-2026-49826

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III. Intelligence Information for CVE-2026-49826

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Patches & Fixes for CVE-2026-49826 (1)

Vendor Advisories for CVE-2026-49826 (1)

Vendor Pages for CVE-2026-49826 (1)

IV. Related Vulnerabilities

Same product: concourse
Same weakness: CWE-601

V. Comments for CVE-2026-49826

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