CVE-2026-49826 json
Concourse login flow has an open redirect issue
published 4mo ago modified last mo. also BIT-concourse-2026-49826 , EUVD-2026-58716 , GHSA-8w27-c4vc-88q9 , GO-2026-5866
- cvss
- 0.0
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 45%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/concourse/concourse 1.6.1-0.20260526150512-ac60be5f0435
- bitnami concourse 8.2.3
- pivotal_software concourse 8.2.3
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
Is CVE-2026-49826 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2mo ago
Exploit prediction
0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 0.0 | 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 |
| CNA | 4.0 | 0.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/concourse/concourse | <1.6.1-0.20260526150512-ac60be5f0435 |
1.6.1-0.20260526150512-ac60be5f0435 |
| bitnami | concourse | <8.2.3 |
8.2.3 |
Affected products
- concourse concourse
Classification
- Weakness
-
- CWE-601 URL Redirection to Untrusted Site
References
-
github.com
/concourse/concourse/commit/ac60be5f0435b6592f5a4fcc089050d72ad2452c
web, patch
-
github.com
/concourse/concourse/security/advisories/GHSA-8w27-c4vc-88q9
web, advisory
-
github.com
/concourse/concourse/releases/tag/v8.2.3
web
-
github.com
/concourse/concourse
package
-
nvd.nist.gov
/vuln/detail/CVE-2026-49826
web
Sources
- CVE List CVE-2026-49826
- GitHub Advisory GHSA-8w27-c4vc-88q9
- NVD CVE-2026-49826
- OSV BIT-concourse-2026-49826
- OSV GO-2026-5866
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.