CVE-2026-57522

Bitwarden Server before 2026.5.0 contains a JSON injection vulnerability in IntegrationTemplateProcessor.ReplaceTokens(), which substitutes user-controlled values into event-integration templates without JSON encoding. When an organization has configured an event integration whose template references a user-controlled token (such as #ActingUserName# or #UserName#, populated from a member's display name), an authenticated member can set their display name to JSON metacharacters and inject arbitrary key-value pairs into the rendered payloads delivered to webhook, SIEM, Slack, Teams, or Datadog endpoints, making injected fields indistinguishable from legitimate template output.

CVSS v3 3.5 LOW

3.5^/10

CVSS v3 : LOW

Vector :

Exploitability : 1.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/bitwarden/server/commit/a26afd18130ef985ede5c97d277820d045185a28	Patch
https://github.com/bitwarden/server/pull/7593	Issue Tracking
https://github.com/bitwarden/server/releases/tag/v2026.5.0	Release Notes
https://sanjokkarki.com.np/blog/bitwarden-webhook-json-injection	Exploit Patch Third Party Advisory
https://www.vulncheck.com/advisories/bitwarden-server-json-injection-via-webhook-templates	Third Party Advisory

Configurations

Configuration 1 (hide)

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

History

No history.

Information

Published : 2026-06-25 20:17

Updated : 2026-07-14 22:17

NVD link : CVE-2026-57522

Mitre link : CVE-2026-57522

CVE.ORG link : CVE-2026-57522

JSON object : View

Products Affected

bitwarden

server

CWE

CWE-74

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

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