What’s Vulnerable › Vulnerabilities

CVE-2026-57521: Bitwarden Server < 2026.5.0 Broken Access Control via PreviewInvoiceController

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-25 · updated 2026-10-25
• Weakness: CWE-862

Description

Bitwarden Server before 2026.5.0 contains a broken access control vulnerability that allows any authenticated user to access arbitrary organization billing data by supplying an arbitrary organizationId to the PreviewInvoiceController endpoints without membership or authorization checks. Attackers can exploit the missing ManageOrganizationBillingRequirement on the preview invoice endpoints to retrieve Stripe-computed tax totals, subscription status, and billing details derived from any target organization's real customer and subscription data.

Affected products

• bitwarden server: before 2026.5.0 — fixed in 2026.5.0

How to fix

Upgrade to a fixed version: bitwarden server 2026.5.0. Check the vendor advisory for mitigations.

References

• https://github.com/bitwarden/server/commit/0a3d9f9deb7d407503207b0d0ca8f0165a890bee
• https://github.com/bitwarden/server/pull/7583
• https://github.com/bitwarden/server/releases/tag/v2026.5.0
• https://sanjokkarki.com.np/blog/bitwarden-preview-invoice-idor
• https://www.vulncheck.com/advisories/bitwarden-server-broken-access-control-via-previewinvoicecontroller

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