Description
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
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
bitwarden server
Default version status: affected
0 to < 2026.5.0affected
pkg:github/bitwarden/serverReferences
- https://sanjokkarki.com.np/blog/bitwarden-webhook-json-injection ↗
- https://github.com/bitwarden/server/releases/tag/v2026.5.0 ↗
- https://github.com/bitwarden/server/pull/7593 ↗
- https://github.com/bitwarden/server/commit/a26afd18130ef985ede5c97d277820d045185a28 ↗
- https://www.vulncheck.com/advisories/bitwarden-server-json-injection-via-webhook-templates ↗