CVE-2026-57520
Bitwarden Server < 2026.5.0 Privilege Escalation via Bulk User Remove Endpoint
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.
INFO
Published Date :
June 25, 2026, 8:17 p.m.
Last Modified :
July 14, 2026, 10:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Bitwarden Server to version 2026.5.0 or later.
- Restrict ManageUsers permission for custom roles.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-57520.
| URL | Resource |
|---|---|
| https://github.com/bitwarden/server/commit/901bb67157c0f80d369c40b76742fdf7623da4e4 | Patch |
| https://github.com/bitwarden/server/pull/7526 | Issue Tracking |
| https://github.com/bitwarden/server/releases/tag/v2026.5.0 | Release Notes |
| https://sanjokkarki.com.np/blog/bitwarden-bulk-remove-admin | Exploit Patch Third Party Advisory |
| https://www.vulncheck.com/advisories/bitwarden-server-privilege-escalation-via-bulk-user-remove-endpoint | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-57520 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-57520
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-57520 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-57520 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://github.com/bitwarden/server', 'vendor': 'bitwarden', 'product': 'server', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2026.5.0', 'versionType': 'semver'}], 'defaultStatus': 'affected'}] [{'repo': 'https://github.com/bitwarden/server', 'vendor': 'bitwarden', 'product': 'server', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2026.5.0', 'versionType': 'semver'}], 'packageURL': 'pkg:github/bitwarden/server', 'defaultStatus': 'affected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 30, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-57520', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-30T03:30:43.781292Z'} -
Initial Analysis by [email protected]
Jun. 27, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:* versions up to (excluding) 2026.5.0 Added Reference Type VulnCheck: https://github.com/bitwarden/server/commit/901bb67157c0f80d369c40b76742fdf7623da4e4 Types: Patch Added Reference Type VulnCheck: https://github.com/bitwarden/server/pull/7526 Types: Issue Tracking Added Reference Type VulnCheck: https://github.com/bitwarden/server/releases/tag/v2026.5.0 Types: Release Notes Added Reference Type VulnCheck: https://sanjokkarki.com.np/blog/bitwarden-bulk-remove-admin Types: Exploit, Patch, Third Party Advisory Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/bitwarden-server-privilege-escalation-via-bulk-user-remove-endpoint Types: Third Party Advisory -
New CVE Received by [email protected]
Jun. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/bitwarden/server', 'vendor': 'bitwarden', 'product': 'server', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2026.5.0', 'versionType': 'semver'}], 'defaultStatus': 'affected'}] Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L Added CWE CWE-862 Added Reference https://github.com/bitwarden/server/commit/901bb67157c0f80d369c40b76742fdf7623da4e4 Added Reference https://github.com/bitwarden/server/pull/7526 Added Reference https://github.com/bitwarden/server/releases/tag/v2026.5.0 Added Reference https://sanjokkarki.com.np/blog/bitwarden-bulk-remove-admin Added Reference https://www.vulncheck.com/advisories/bitwarden-server-privilege-escalation-via-bulk-user-remove-endpoint