CVE-2026-101878
- Source
- https://cve.org/CVERecord?id=CVE-2026-101878
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-101878.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-101878
- Published
- 2026-09-29T01:58:32Z
- Modified
- 2026-10-21T02:54:27Z
- Severity
-
- 7.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Bitwarden Server 2025.6.0 < 2025.6.0 Authentication Bypass via SSO Identifier Truncation
- Details
-
Bitwarden Server 2025.6.0 before 2026.5.0 declares the @ExternalId parameter of the User_ReadBySsoUserOrganizationIdExternalId stored procedure as NVARCHAR(50) while the column it queries stores NVARCHAR(300), silently truncating the SSO login identifier on SQL Server deployments and allowing a user whose identity-provider identifier begins with another organization member's full 50-character identifier to authenticate as that member and obtain a victim-scoped access token.
- Database specific
{ "cna_assigner": "VulnCheck", "cwe_ids": [ "CWE-303" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101878.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101878.json
- https://github.com/bitwarden/server/releases/tag/v2026.5.0
- https://nvd.nist.gov/vuln/detail/CVE-2026-101878
- https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-sso-identifier-truncation
- https://github.com/bitwarden/server/pull/7501
- https://github.com/bitwarden/server/commit/27ae3d5455f723975fac03819eaeba8710666bc4
- https://github.com/bitwarden/server
- https://sanjokkarki.com.np/blog/bitwarden-sso-externalid-truncation
Affected packages
Git / github.com/bitwarden/server
Affected ranges
- Type
- GIT
- Repo
- https://github.com/bitwarden/server
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "2025.6.0" }, { "fixed": "2026.5.0" } ], "source": "AFFECTED_FIELD", "strategy": "StandardRange" }, { "original_tag": "v2026.5.0", "range": [ { "fixed": "c3cabffccfe35004f5022f91f95cc0fb5e8aa7c4" } ], "source": "REFERENCES_TAG" }, { "range": [ { "fixed": "27ae3d5455f723975fac03819eaeba8710666bc4" } ], "source": "REFERENCES_COMMIT" } ] }