Broken Access Control in Bitwarden Server Affecting User Billing Data
CVE-2026-57521

5.3MEDIUM

Key Information:

Vendor

Bitwarden

Status
Server
Vendor
CVE Published:
25 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-57521?

Bitwarden Server versions prior to 2026.5.0 exhibit a broken access control vulnerability that permits authenticated users to retrieve unauthorized organization billing data. By exploiting the PreviewInvoiceController endpoints, attackers can submit arbitrary organization IDs without proper membership or authorization, gaining access to sensitive details such as Stripe-calculated tax totals, subscription statuses, and billing information of targeted organizations. This vulnerabilities arise from the lack of crucial access management checks in the preview invoice processes, potentially exposing real customer data.

Affected Version(s)

server 0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-57521 - Proof of Concept

References

https://sanjokkarki.com.np/blog/bitwarden-preview-invoice...
technical-descriptionexploit
https://github.com/bitwarden/server/releases/tag/v2026.5.0
release-notes
https://github.com/bitwarden/server/pull/7583
issue-tracking

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sanjok Karki
.