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CVE-2026-57520

Bitwarden Server broken access control

7.1 HIGHPublic exploitEPSS 0.64%
  1. Published25 Jun 2026

Description

Bitwarden Server before 2026.5.0 contains a privilege escalation vulnerability that allows authenticated Custom users with ManageUsers permission to remove Admin accounts from an organization by exploiting a missing role hierarchy check in the bulk user-remove endpoint. Attackers can supply Admin organization-user IDs in a bulk DELETE request to bypass the guard enforced on the single-user removal path, effectively removing one or more Admin accounts from an organization.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Affected products

Bitwarden Server< 2026.5.0

Remediation

Fixed in
Bitwarden Server≥ 2026.5.0

References

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Frequently asked

Is CVE-2026-57520 being actively exploited?

CVE-2026-57520 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.64%.

How severe is CVE-2026-57520?

CVE-2026-57520 has a CVSS 3.1 base score of 7.1, rated high. EPSS estimates a 0.64% probability of exploitation.

Which products are affected by CVE-2026-57520?

Affected products include Bitwarden Server.

How do I fix CVE-2026-57520?

Upgrade affected software to a fixed version, for example Bitwarden Server 2026.5.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-57520 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.