# CVE-2026-57522: Bitwarden Server < 2026.5.0 JSON Injection via Webhook Templates

> CVE-2026-57522: Bitwarden Server < 2026.5.0 JSON Injection via Webhook Templates. CVSS 3.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-57522
Last updated: 2026-07-14T22:17:23Z

- Published: 2026-06-25 19:09 UTC · Updated: 2026-07-14 22:17 UTC · Assigner: VulnCheck
- CVSS: 3.5 (CVSS 3.1) · Severity: Low · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N
- EPSS: 0.46%, 39th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-74

## 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 vendors and products

- bitwarden: server

## Tracked companies

- [Bitwarden](https://rewindex.com/company/bitwarden.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-57522)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-57522)
- [https://github.com/bitwarden/server/commit/a26afd18130ef985ede5c97d277820d045185a28](https://github.com/bitwarden/server/commit/a26afd18130ef985ede5c97d277820d045185a28)
- [https://github.com/bitwarden/server/pull/7593](https://github.com/bitwarden/server/pull/7593)
- [https://github.com/bitwarden/server/releases/tag/v2026.5.0](https://github.com/bitwarden/server/releases/tag/v2026.5.0)
- [https://sanjokkarki.com.np/blog/bitwarden-webhook-json-injection](https://sanjokkarki.com.np/blog/bitwarden-webhook-json-injection)
- [https://www.vulncheck.com/advisories/bitwarden-server-json-injection-via-webhook-templates](https://www.vulncheck.com/advisories/bitwarden-server-json-injection-via-webhook-templates)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-57522 · Markdown: https://rewindex.com/cve/CVE-2026-57522.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-57522 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:26.473Z