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CVE-2026-57522

Bitwarden Server < 2026.5.0 JSON Injection via Webhook Templates

Published: Jun 25, 2026Updated: Jul 14, 2026 Sources: CVE List NVDCWE-74
3.5LOW
NVD MITRE
EPSS Score
0.3%
Top 82.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:CC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-74

Affected Products

bitwarden
oss-projectaka bitwarden cli
serverMixed
Security Products / identity-access-mgmt

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/bitwarden/server/commit/a26afd18130ef985ede5c97d277820d045185a28
github.com
https://github.com/bitwarden/server/pull/7593
github.com
https://github.com/bitwarden/server/releases/tag/v2026.5.0
github.com
and 2 more references View all →

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