CVE-2026-57522
Bitwarden Server < 2026.5.0 JSON Injection via Webhook Templates
- State
- Published
- Severity
- 2.3 Low
- Published
- Jun 25, 2026
- Updated
- Jul 14, 2026
- Reserved
- Jun 24, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 2.3 Low | 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 | VulnCheck |
| 3.1 | 3.5 Low | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N | VulnCheck |
Weaknesses
- CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Affected Products
| Product | Versions |
|---|---|
serverbitwarden |
|
References
- https://sanjokkarki.com.np/blog/bitwarden-webhook-json-injectiontechnical-descriptionexploit
- https://github.com/bitwarden/server/releases/tag/v2026.5.0release-notes
- https://github.com/bitwarden/server/pull/7593issue-tracking
- https://github.com/bitwarden/server/commit/a26afd18130ef985ede5c97d277820d045185a28patch
- https://www.vulncheck.com/advisories/bitwarden-server-json-injection-via-webhook-templatesthird-party-advisory
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