Unrated
Concourse login flow has an open redirect issue
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-49826
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 06:02 UTC · Revision 1
Source evidence
Concourse login flow has an open redirect issue
core-osv · Original sourcePublished 14 Aug 2026, 16:25 UTC
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.
osv:CVE-2026-49826
Complete source record
{
"id": "256ffeb438f79f6c9d36be186671329a08306b62c92fad591b2f4c6b97446ec5",
"url": "https://osv.dev/vulnerability/CVE-2026-49826",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Concourse login flow has an open redirect issue",
"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.",
"evidence": "osv:CVE-2026-49826",
"products": [],
"severity": "unknown",
"structured": {
"id": "CVE-2026-49826",
"aliases": [
"BIT-concourse-2026-49826",
"CVE-2026-49826",
"GHSA-8w27-c4vc-88q9",
"GO-2026-5866"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/concourse/concourse",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "ac60be5f0435b6592f5a4fcc089050d72ad2452c"
}
],
"database_specific": {
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{
"range": [
{
"introduced": "0"
},
{
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}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
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{
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"source": "REFERENCES_COMMIT"
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{
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],
"source": "REFERENCES_TAG",
"original_tag": "v8.2.3"
},
{
"range": [
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{
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49826.json"
}
}
],
"modified": "2026-10-28T02:30:43.190866591Z",
"provider": "osv",
"references": [
"https://github.com/concourse/concourse/releases/tag/v8.2.3",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49826.json",
"https://github.com/concourse/concourse/security/advisories/GHSA-8w27-c4vc-88q9",
"https://nvd.nist.gov/vuln/detail/CVE-2026-49826",
"https://github.com/concourse/concourse/commit/ac60be5f0435b6592f5a4fcc089050d72ad2452c"
],
"provider_metadata": {
"cwe_ids": [
"CWE-601"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49826.json"
}
},
"related_cves": [
{
"value": "CVE-2026-49826",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 510926,
"published_at": "2026-08-14T16:25:56.406+00:00"
}