Auth bypass in Bitwarden Server
CVE-2026-57521
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (36.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Bitwarden Server — versions 0
Weakness classification (CWE)
References
- sanjokkarki.com.np/blog/bitwarden-preview-invoice-idor (Exploit, technical-description, Patch, Third Party Advisory, exploit)
- github.com/bitwarden/server/releases/tag/v2026.5.0 (release-notes, Release Notes)
- github.com/bitwarden/server/pull/7583 (issue-tracking, Issue Tracking)
- github.com/bitwarden/server/commit/0a3d9f9deb7d407503207b0d0ca8f0165a890bee (Patch, patch)
- www.vulncheck.com/advisories/bitwarden-server-broken-access-control-via-preview… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-57521?
- CVE-2026-57521 is a medium-severity vulnerability in Bitwarden Server, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-06-25.
- How severe is CVE-2026-57521?
- Medium severity. CVSS v3 base score is 4.3 out of 10.