{"id":"CVE-2026-4525","aliases":["GHSA-72gw-fmmr-c4r4","BIT-vault-2026-4525","GO-2026-5199"],"title":"HashiCorp Vault May Expose Tokens to Auth Plugins Due to Incorrect Header Sanitization","summary":"HashiCorp Vault May Expose Tokens to Auth Plugins Due to Incorrect Header Sanitization","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"hashicorp","product":"github.com/hashicorp/vault","ecosystem":"go","affected":["github.com/hashicorp/vault >= 0.11.2, <= 1.21.4"],"published":"2026-04-17","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:50:43.378842123Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-72gw-fmmr-c4r4","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4525"},{"url":"https://access.redhat.com/security/cve/CVE-2026-4525"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2459107"},{"url":"https://discuss.hashicorp.com/t/hcsec-2026-07-vault-may-expose-tokens-to-auth-plugins-due-to-incorrect-header-sanitization/77344"},{"url":"https://github.com/advisories/GHSA-72gw-fmmr-c4r4"},{"url":"https://github.com/hashicorp/vault"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4525.json"}],"tags":["osv","go"],"epss":0.00406,"epssPercentile":0.3451,"ingestedAt":"2026-07-21T19:04:58.193Z","slug":"CVE-2026-4525","body":"## Overview\n\nIf a Vault auth mount is configured to pass through the \"Authorization\" header, and the \"Authorization\" header is used to authenticate to Vault, Vault forwarded the Vault token to the auth plugin backend. Fixed in 2.0.0, 1.21.5, 1.20.10, and 1.19.16.\n\n## Affected packages\n\n- `github.com/hashicorp/vault >= 0.11.2, <= 1.21.4`\n\n## Remediation\n\nRefer to the advisory for the patched release.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}