Read the docs
TI-2026-41412 Aliases CVE-2026-57522GHSA-w6hw-45mp-qr7v

Bitwarden Server < 2026.5.0 JSON Injection via Webhook Templates

Priority MEDIUM 45CWE-74Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

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 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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00455 39th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix Fixed server (bitwarden): 2026.5.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
bitwardenserverbefore 2026.5.02026.5.0Patch availableCNA
  • server Vendorbitwarden Affected before 2026.5.0 Fixed in 2026.5.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:*before 2026.5.0Vulnerablebitwarden
  • cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:* Versions before 2026.5.0 Vulnerable ·bitwarden

Remediation

  • Fix · CNA server (bitwarden) Fixed in 2026.5.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    bitwarden server 2026.5.0

    3 records Highest priority Priority MEDIUM 3 MEDIUM

    Other records, highest priority first

    • TI-2026-41410 Bitwarden Server < 2026.5.0 Privilege Escalation via Bulk User Remove EndpointPriority MEDIUM 64
    • TI-2026-41411 Bitwarden Server < 2026.5.0 Broken Access Control via PreviewInvoiceControllerPriority MEDIUM 57
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-57522
  2. 2026-10-03 Alias added: GHSA-w6hw-45mp-qr7v

References

Exploit 1

Patch 2

Other 1

  • TI-2026-42828 Bitwarden Server < 2026.6.0 Authorization Bypass via Admin Auth Request CVSS 4.0CRITICAL 9.3
  • TI-2026-31741 Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients CVSS 4.0HIGH 8.9
  • TI-2026-31742 Bitwarden Server < 2026.4.1 Authentication Bypass via SCIM API Key CVSS 4.0HIGH 8.6
  • TI-2026-41410 Bitwarden Server < 2026.5.0 Privilege Escalation via Bulk User Remove Endpoint CVSS 4.0HIGH 7.1
  • TI-2026-41411 Bitwarden Server < 2026.5.0 Broken Access Control via PreviewInvoiceController CVSS 4.0MEDIUM 5.3
  • TI-2026-31740 Bitwarden Server < 2026.4.1 Missing Authorization via Organization Cipher Import CVSS 4.0MEDIUM 5.3
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences