CVE-2026-57522: Bitwarden Server

Medium severity, CVSS 5.0. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Bitwarden Server: before 2026.5.0 (fixed in 2026.5.0)

Published 2026-06-25. Last modified 2026-07-14.