CVE-2026-57520

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 v3.1 Score

7.1

HIGH

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

EPSS — Exploit Prediction

0.0035

Probability of exploitation

0.27%

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/901bb67157c0f80d369c40b76742fdf7623da4e4 https://sanjokkarki.com.np/blog/bitwarden-bulk-remove-admin

Exploits

https://sanjokkarki.com.np/blog/bitwarden-bulk-remove-admin

Other References

https://github.com/bitwarden/server/pull/7526 https://github.com/bitwarden/server/releases/tag/v2026.5.0 https://www.vulncheck.com/advisories/bitwarden-server-privilege-escalation-via-bulk-user-remove-endpoint

Frequently Asked Questions

What is CVE-2026-57520? +

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. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-57520? +

CVE-2026-57520 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0035, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-57520? +

CVE-2026-57520 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-2026-57520? +

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.

Related Vulnerabilities

CVE-2026-40570

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, the `load_customer_info` action in `POST /conversation/ajax` …

CVE-2026-42317

GLPI is a free asset and IT management software package. Starting in version 0.78 and prior to versions 10.0.25 and …

CVE-2026-4881

In affected versions of Octopus Server, permissions were not checked correctly resulting in any authenticated user being able to make …

CVE-2026-40543

SOPlanning does not enforce authorization for backup functionalities. An unauthenticated attacker can directly query backup-related endpoints and retrieve backup archives …

CVE-2026-10831

A denial-of-service vulnerability exists in NPort devices because of improper access control on the command port. The command interface does …

CVE-2026-40314

NamelessMC is website software for Minecraft servers. In version 2.2.4,`core/classes/Misc/ProfilePostReactionContext.php` only verifies that the wall post exists and does not …