Dashboard / CVE-2026-101878

CVE-2026-101878

HIGH
MEDIUM Priority: 0.02 BB Relevance: 65/100
Published: 2026-09-29 Modified: 2026-11-08 First seen: 2026-11-08 Status: active

Attack Surface

Network Low Complexity No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: High
PR: Low
UI: None
AT: None
VC: High
VI: High
VA: High

Description

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
bitwarden bitwarden server 2025.6.0 < 2026.5.0

References & Advisories (5)

Bug Bounty Relevance

65 / 100
✓ Network accessible
✓ Low complexity
✓ No user interaction

CVSS Score

7.7 / 10.0 v4.0
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

EPSS — Exploitation Probability

0.26%
Raw Score 0.002580
Percentile 17.7%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00258
2026-11-12
0.00258
2026-11-10
0.00258
2026-11-09
0.00258
2026-11-08
0.00258

Intelligence Sources

mitre ref →

External Links