{"id":"CVE-2026-57522","title":"Bitwarden Server < 2026.5.0 JSON Injection via Webhook Templates","summary":"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 organizati…","severity":"low","cvss":3.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N","cvssSource":"cna","cwe":["CWE-74"],"vendor":"bitwarden","product":"server","affected":["server < 2026.5.0"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-26T14:04:15.668971Z"},"exploitAvailable":true,"published":"2026-06-25","updated":"2026-11-08","sourceUpdated":"2026-11-08T14:06:32.815Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-57522","references":[{"url":"https://sanjokkarki.com.np/blog/bitwarden-webhook-json-injection"},{"url":"https://github.com/bitwarden/server/releases/tag/v2026.5.0","label":"server 2026.5.0 Release Notes"},{"url":"https://github.com/bitwarden/server/pull/7593"},{"url":"https://github.com/bitwarden/server/commit/a26afd18130ef985ede5c97d277820d045185a28"},{"url":"https://www.vulncheck.com/advisories/bitwarden-server-json-injection-via-webhook-templates"}],"tags":["cve.org","exploit-available"],"epss":0.00455,"epssPercentile":0.39704,"ingestedAt":"2026-11-08T14:51:22.324Z","slug":"CVE-2026-57522","body":"## Overview\n\nBitwarden 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.\n\n## Affected\n\n- `server < 2026.5.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":31,"depthScoreParts":{"impact":19.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}