Vulnerability record · CVE-2026-57520 · published 25 June 2026

CVE-2026-57520: Bitwarden server missing authorization vulnerability

Bitwarden · Server

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.

7.1 CVSS 4.0 High EPSS 0.64% · top 51.5% CWE-862 · Missing authorization

7.1CVSS 4.0 base score

0.64%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

5References, 1 tagged exploit

14 Jul 2026Last modified by NVD

Description

CVSS:4.0/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Server Bitwarden

References

Link	Tags
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	ExploitPatchThird Party Advisory
https://www.vulncheck.com/advisories/bitwarden-server-privilege-escalation-via-bulk-user-remove-endpoint	Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.3CVE-2026-60104Bitwarden server insecure direct object reference vulnerabilityBitwarden Server before 2026.6.0 does not verify that the email in a POST /auth-requests/admin-request body belongs to the authenticated caller, allo…EPSS 0.37%8 Jul 2026 8.9CVE-2026-43639Bitwarden server missing authorization vulnerabilityBitwarden Server prior to v2026.4.0 contains a missing authorization vulnerability that allows a provider service user to add an arbitrary organizati…EPSS 0.84%11 May 2026 8.6CVE-2026-43640Bitwarden server vulnerabilityBitwarden Server prior to v2026.4.1 does not require master-password re-authentication when retrieving or rotating an organization's SCIM API key, al…EPSS 0.71%11 May 2026 7.5CVE-2020-15879Bitwarden server server-side request forgery (ssrf) vulnerabilityBitwarden Server 1.35.1 allows SSRF because it does not consider certain IPv6 addresses (ones beginning with fc, fd, fe, or ff, and the :: address) a…EPSS 2.7%21 Jul 2020 7.5CVE-2019-19766Bitwarden server vulnerabilityThe Bitwarden server through 1.32.0 has a potentially unwanted KDF.EPSS 1.3%12 Dec 2019 5.3CVE-2026-57521Bitwarden server missing authorization vulnerabilityBitwarden Server before 2026.5.0 contains a broken access control vulnerability that allows any authenticated user to access arbitrary organization b…EPSS 0.43%25 Jun 2026 5.3CVE-2026-43638Bitwarden server missing authorization vulnerabilityBitwarden Server prior to v2026.4.1 contains a missing authorization vulnerability that allows any authenticated user to write ciphers into an arbitr…EPSS 0.33%11 May 2026 2.3CVE-2026-57522Bitwarden server injection vulnerabilityBitwarden Server before 2026.5.0 contains a JSON injection vulnerability in IntegrationTemplateProcessor.ReplaceTokens(), which substitutes user-cont…EPSS 0.46%25 Jun 2026

Source: NIST National Vulnerability Database (record CVE-2026-57520), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.