CVE-2026-57522: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in bitwarden server
Bitwarden Server versions prior to 2026.5.0 contain a JSON injection vulnerability in the IntegrationTemplateProcessor.ReplaceTokens() function. This vulnerability arises because user-controlled values are substituted into event-integration templates without proper JSON encoding. Authenticated members can exploit this by setting their display name to JSON metacharacters, injecting arbitrary key-value pairs into payloads sent to webhook, SIEM, Slack, Teams, or Datadog endpoints. The injected fields appear indistinguishable from legitimate template output. The vulnerability has a low CVSS score of 2.3 and no known exploits in the wild.
AI Analysis
Technical Summary
CVE-2026-57522 is a JSON injection vulnerability in Bitwarden Server before version 2026.5.0. The issue exists in the IntegrationTemplateProcessor.ReplaceTokens() method, which inserts user-controlled tokens such as #ActingUserName# or #UserName# into event integration templates without JSON encoding. This allows an authenticated user to craft their display name with JSON metacharacters, injecting arbitrary JSON key-value pairs into the rendered payloads that are sent to various integration endpoints. This can cause the injected data to blend with legitimate output, potentially misleading downstream systems consuming these payloads.
Potential Impact
An authenticated member can inject arbitrary JSON data into event integration payloads delivered to external endpoints like webhooks, SIEM, Slack, Teams, or Datadog. This could lead to confusion or manipulation of downstream processing or logging systems that consume these payloads. However, the vulnerability requires authentication and has a low CVSS score, indicating limited impact and exploitability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, organizations should review and potentially restrict the use of user-controlled tokens in event integration templates or sanitize user display names to prevent injection of JSON metacharacters. Monitor vendor communications for updates on patches or official mitigations.
CVE-2026-57522: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in bitwarden server
Description
Bitwarden Server versions prior to 2026.5.0 contain a JSON injection vulnerability in the IntegrationTemplateProcessor.ReplaceTokens() function. This vulnerability arises because user-controlled values are substituted into event-integration templates without proper JSON encoding. Authenticated members can exploit this by setting their display name to JSON metacharacters, injecting arbitrary key-value pairs into payloads sent to webhook, SIEM, Slack, Teams, or Datadog endpoints. The injected fields appear indistinguishable from legitimate template output. The vulnerability has a low CVSS score of 2.3 and no known exploits in the wild.
CVSS v4.0
Score 2.3low
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-57522 is a JSON injection vulnerability in Bitwarden Server before version 2026.5.0. The issue exists in the IntegrationTemplateProcessor.ReplaceTokens() method, which inserts user-controlled tokens such as #ActingUserName# or #UserName# into event integration templates without JSON encoding. This allows an authenticated user to craft their display name with JSON metacharacters, injecting arbitrary JSON key-value pairs into the rendered payloads that are sent to various integration endpoints. This can cause the injected data to blend with legitimate output, potentially misleading downstream systems consuming these payloads.
Potential Impact
An authenticated member can inject arbitrary JSON data into event integration payloads delivered to external endpoints like webhooks, SIEM, Slack, Teams, or Datadog. This could lead to confusion or manipulation of downstream processing or logging systems that consume these payloads. However, the vulnerability requires authentication and has a low CVSS score, indicating limited impact and exploitability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, organizations should review and potentially restrict the use of user-controlled tokens in event integration templates or sanitize user display names to prevent injection of JSON metacharacters. Monitor vendor communications for updates on patches or official mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-24T15:58:58.537Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3d89044853345fc16510b9
Added to database: 06/25/2026, 20:01:08 UTC
Last enriched: 06/25/2026, 20:12:18 UTC
Last updated: 06/25/2026, 20:25:20 UTC
Views: 4
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