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

Quick assessment

Affected
bitwarden server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Bitwarden server是美国Bitwarden公司开源的一款密码管理服务器软件。 Bitwarden Server 2026.4.0版本存在输入验证错误漏洞，该漏洞源于IntegrationTemplateProcessor.ReplaceTokens()函数在替换用户可控值到事件集成模板时未进行JSON编码，可能导致经过身份验证的成员注入任意键值对到渲染的有效载荷中。

CVSS 3.5 · Low EPSS 0.46% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
bitwarden server < 2026.5.0 affected
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I. Basic Information for CVE-2026-57522

Vulnerability Information
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Vulnerability Title
Bitwarden Server < 2026.5.0 JSON Injection via Webhook Templates
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Bitwarden Server 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bitwarden server是美国Bitwarden公司开源的一款密码管理服务器软件。 Bitwarden Server 2026.4.0版本存在输入验证错误漏洞，该漏洞源于IntegrationTemplateProcessor.ReplaceTokens()函数在替换用户可控值到事件集成模板时未进行JSON编码，可能导致经过身份验证的成员注入任意键值对到渲染的有效载荷中。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
bitwarden server 0 ~ 2026.5.0 -

II. Public POCs for CVE-2026-57522

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III. Intelligence Information for CVE-2026-57522

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Patches & Fixes for CVE-2026-57522 (2)

Vendor Advisories for CVE-2026-57522 (1)

Security Blog Posts for CVE-2026-57522 (1)

Vendor Pages for CVE-2026-57522 (1)

Same Patch Batch · bitwarden · 2026-06-25 · 3 CVEs total

CVE-2026-57520 7.1 HIGH Bitwarden Server < 2026.5.0 Privilege Escalation via Bulk User Remove Endpoint
CVE-2026-57521 4.3 MEDIUM Bitwarden Server < 2026.5.0 Broken Access Control via PreviewInvoiceController

IV. Related Vulnerabilities

Same product: server
Same vendor: bitwarden
Same weakness: CWE-74

V. Comments for CVE-2026-57522

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