How severe is CVE-2026-57521?

CVE-2026-57521 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-57521 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-57521?

CVE-2026-57521 affects Bitwarden Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-57521?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-57521 have an EU (EUVD) identifier?

Yes. CVE-2026-57521 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39542.

When was CVE-2026-57521 published?

CVE-2026-57521 was published on 2026-06-25 and last updated on 2026-06-27.

CVE-2026-57521

CVE-2026-57521 is a medium-severity vulnerability in Bitwarden Server with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v4: 5.3
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39542
Weakness: CWE-862
Affected product: Bitwarden Server
Published: 2026-06-25
Last modified: 2026-06-27

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.

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.
How severe is CVE-2026-57521?: CVE-2026-57521 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-57521 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-57521?: CVE-2026-57521 affects Bitwarden Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-57521?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-57521 have an EU (EUVD) identifier?: Yes. CVE-2026-57521 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39542.
When was CVE-2026-57521 published?: CVE-2026-57521 was published on 2026-06-25 and last updated on 2026-06-27.

References

Affected products (1)

cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:*

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