{"id":"CVE-2020-11576","aliases":["BIT-argo-cd-2020-11576","EUVD-2021-2593","GHSA-vj54-cjrx-x696","GO-2022-0882"],"status":"published","title":"Observable Discrepancy in Argo","description":"Fixed in v1.5.1, Argo version v1.5.0 was vulnerable to a user-enumeration vulnerability which allowed attackers to determine the usernames of valid (non-SSO) accounts because /api/v1/session returned 401 for an existing username and 404 otherwise.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01973,"percentile":0.80698,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-203"],"published":"2020-04-08T17:40:50Z","modified":"2026-10-20T10:51:02Z","fixes":[{"ecosystem":"Go","package":"github.com/argoproj/argo-cd","fixed_in":["1.5.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/argoproj/argo-cd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.5.0"},{"last_affected":"1.5.0"},{"fixed":"1.5.1"}]}],"versions":["1.5.0"]},{"source":"osv","ecosystem":"Bitnami","package":"argo-cd","ranges":[{"type":"SEMVER","events":[{"introduced":"1.5.0"},{"last_affected":"1.5.0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/argoproj/argo-cd","ranges":[{"type":"SEMVER","events":[{"introduced":"1.5.0"},{"fixed":"1.5.1"}]}],"versions":["1.5.0"]},{"source":"osv","ecosystem":"Go","package":"github.com/argoproj/argo-cd","ranges":[{"type":"SEMVER","events":[{"introduced":"1.5.0"},{"fixed":"1.5.1"}]}]}],"products":[{"vendor":"argoproj","product":"argo_cd"}],"references":[{"url":"https://github.com/argoproj/argo-cd/pull/3215","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","web","fix"]},{"url":"https://github.com/argoproj/argo-cd/commit/35a7350b7444bcaf53ee0bb11b9d8e3ae4b717a1","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","web","fix"]},{"url":"https://www.soluble.ai/blog/argo-cves-2020","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","web","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-11576","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-vj54-cjrx-x696","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2020-11576","description":"Fixed in v1.5.1, Argo version v1.5.0 was vulnerable to a user-enumeration vulnerability which allowed attackers to determine the usernames of valid (non-SSO) accounts because /api/v1/session returned 401 for an existing username and 404 otherwise.","status":"published","published":"2020-04-08T17:40:50Z","modified":"2024-08-04T11:35:13.537Z","updated_at":"2026-11-02T14:35:57.67317Z"}],"euvd":[{"id":"EUVD-2021-2593","description":"Fixed in v1.5.1, Argo version v1.5.0 was vulnerable to a user-enumeration vulnerability which allowed attackers to determine the usernames of valid (non-SSO) accounts because /api/v1/session returned 401 for an existing username and 404 otherwise.","status":"published","published":"2020-04-08T17:40:50Z","modified":"2024-08-04T11:35:13Z","updated_at":"2026-11-03T03:07:42.412087Z"}],"ghsa":[{"id":"GHSA-vj54-cjrx-x696","title":"Observable Discrepancy in Argo","description":"Fixed in v1.5.1, Argo version v1.5.0 was vulnerable to a user-enumeration vulnerability which allowed attackers to determine the usernames of valid (non-SSO) accounts because /api/v1/session returned 401 for an existing username and 404 otherwise.\n\n### Specific Go Packages Affected\ngithub.com/argoproj/argo-cd/util/session\ngithub.com/argoproj/argo-cd/server/session","status":"published","published":"2021-12-09T19:59:24Z","modified":"2023-09-29T17:24:55Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T14:37:06.913882Z"}],"nvd":[{"id":"CVE-2020-11576","description":"Fixed in v1.5.1, Argo version v1.5.0 was vulnerable to a user-enumeration vulnerability which allowed attackers to determine the usernames of valid (non-SSO) accounts because /api/v1/session returned 401 for an existing username and 404 otherwise.","status":"published","published":"2020-04-08T18:15:15.323Z","modified":"2026-06-17T02:50:24.777Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T14:05:57.678762Z"}],"osv":[{"id":"CVE-2020-11576","description":"Fixed in v1.5.1, Argo version v1.5.0 was vulnerable to a user-enumeration vulnerability which allowed attackers to determine the usernames of valid (non-SSO) accounts because /api/v1/session returned 401 for an existing username and 404 otherwise.","status":"published","published":"2020-04-08T18:15:15.323Z","modified":"2026-10-20T10:51:02.471360933Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:14.034736Z"},{"id":"GHSA-vj54-cjrx-x696","title":"Observable Discrepancy in Argo","description":"Fixed in v1.5.1, Argo version v1.5.0 was vulnerable to a user-enumeration vulnerability which allowed attackers to determine the usernames of valid (non-SSO) accounts because /api/v1/session returned 401 for an existing username and 404 otherwise.\n\n### Specific Go Packages Affected\ngithub.com/argoproj/argo-cd/util/session\ngithub.com/argoproj/argo-cd/server/session","status":"published","published":"2021-12-09T19:59:24Z","modified":"2024-08-21T15:58:41.43342Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T15:46:57.348035Z"},{"id":"BIT-argo-cd-2020-11576","description":"Fixed in v1.5.1, Argo version v1.5.0 was vulnerable to a user-enumeration vulnerability which allowed attackers to determine the usernames of valid (non-SSO) accounts because /api/v1/session returned 401 for an existing username and 404 otherwise.","status":"published","published":"2024-03-06T10:52:16.982Z","modified":"2024-08-21T15:58:41.43342Z","updated_at":"2026-11-02T15:28:28.267217Z"},{"id":"GO-2022-0882","title":"Observable Discrepancy in Argo in github.com/argoproj/argo-cd","description":"Observable Discrepancy in Argo in github.com/argoproj/argo-cd","status":"published","published":"2024-08-21T15:29:06Z","modified":"2026-03-03T04:52:19.877597Z","updated_at":"2026-11-02T15:47:00.918515Z"}]}}