CVE-2026-101878

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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

2026-09-30T03:47:01Z

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

Affected packages

Git / github.com/bitwarden/server

Affected ranges

Type

GIT

Repo

https://github.com/bitwarden/server

Events

Introduced

1f9849da10f9b9e34887a175e212254884d77798

Fixed

c3cabffccfe35004f5022f91f95cc0fb5e8aa7c4

Fixed

27ae3d5455f723975fac03819eaeba8710666bc4

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "2025.6.0"
        },
        {
            "fixed":  "2026.5.0"
        }
    ],
    "source":  [
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-101878.json"