Bitwarden Server < 2026.5.0 JSON Injection via Webhook Templates_CVE-2026-57522

{
    "lastseen": "",
    "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.",
    "published": "2026-06-25T19:09:33.881Z",
    "modified": "2026-06-25T19:09:33.881Z",
    "type": "cve",
    "title": "Bitwarden Server < 2026.5.0 JSON Injection via Webhook Templates",
    "source": "VulnCheck",
    "references": "https://sanjokkarki.com.np/blog/bitwarden-webhook-json-injection\nhttps://github.com/bitwarden/server/releases/tag/v2026.5.0\nhttps://github.com/bitwarden/server/pull/7593\nhttps://github.com/bitwarden/server/commit/a26afd18130ef985ede5c97d277820d045185a28\nhttps://www.vulncheck.com/advisories/bitwarden-server-json-injection-via-webhook-templates",
    "id": "CVE-2026-57522",
    "bulletinFamily": "",
    "cwe": [
        "CWE-74"
    ],
    "cvelist": null,
    "sourceData": "bitwarden server 0",
    "sourceHref": "",
    "cvss": {
        "score": 2.3,
        "severity": "LOW",
        "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "server",
    "version": "0",
    "vendor": "bitwarden",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}