5

CVE-2026-57522

Exploit

Bitwarden Server < 2026.5.0 JSON Injection via Webhook Templates

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Bitwarden ≫ Server Version < 2026.5.0
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.26% 0.178
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 5 3.1 1.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
disclosure@vulncheck.com 2.3 0 0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
disclosure@vulncheck.com 3.5 1.8 1.4
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N
CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

https://github.com/bitwarden/server/releases/tag/v2026.5.0
Release Notes
https://sanjokkarki.com.np/blog/bitwarden-webhook-json-injection
Patch
Third Party Advisory
Exploit
https://github.com/bitwarden/server/pull/7593
Issue Tracking
https://github.com/bitwarden/server/commit/a26afd18130ef985ede5c97d277820d045185a28
Patch
https://www.vulncheck.com/advisories/bitwarden-server-json-injection-via-webhook-templates
Third Party Advisory