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.
Severity (CVSS)
| Base score | 2.3 |
|---|---|
| Severity | Low |
| Version | CVSS 4.0 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N |
| Provided by | CNA |
Weaknesses
- CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Affected products
| Vendor | Product | Versions |
|---|---|---|
| bitwarden | server | 0 to <2026.5.0 |
References
- https://sanjokkarki.com.np/blog/bitwarden-webhook-json-injection (technical-description exploit)
- https://github.com/bitwarden/server/releases/tag/v2026.5.0 (release-notes)
- https://github.com/bitwarden/server/pull/7593 (issue-tracking)
- https://github.com/bitwarden/server/commit/a26afd18130ef985ede5c97d277820d045185a28 (patch)
- https://www.vulncheck.com/advisories/bitwarden-server-json-injection-via-webhook-templates (third-party-advisory)
Generated from the official CVE List on 26 Jun 2026 07:05 UTC.