CVE-2026-57521

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.

CVSS v3.1 Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS — Exploit Prediction

0.0025

Probability of exploitation

0.16%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-862 Missing Authorization

Affected Products

Vendor	Product	Versions
bitwarden	server	< 2026.5.0

References

Advisories & Patches

https://github.com/bitwarden/server/commit/0a3d9f9deb7d407503207b0d0ca8f0165a890bee https://sanjokkarki.com.np/blog/bitwarden-preview-invoice-idor

Exploits

https://sanjokkarki.com.np/blog/bitwarden-preview-invoice-idor

Other References

https://github.com/bitwarden/server/pull/7583 https://github.com/bitwarden/server/releases/tag/v2026.5.0 https://www.vulncheck.com/advisories/bitwarden-server-broken-access-control-via-previewinvoicecontroller

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-57521? +

CVE-2026-57521 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0025, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-57521? +

CVE-2026-57521 affects products from bitwarden, specifically: server. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-57521? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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