CVE-2026-57522 | Bitwarden Server before 2026.5.0 contains a JSON injection v… | CVSS 3.5 LOW

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.

Metadata

CVE ID: CVE-2026-57522
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-24 15:58 UTC
Published: 2026-06-25 19:09 UTC
Last updated: 2026-06-25 19:09 UTC
Primary CWE: CWE-74
Improper Neutralization of Special Elements in Output Used b…
Vendor / Product: bitwarden / server
Sources: cve.org · NVD

Severity & Metrics

3.5 LOW CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N

Affected products (1)

Vendor	Product	Platform	Versions
bitwarden	server	—	0 < 2026.5.0

Weakness (CWE)

CWE	Source	Description
CWE-74	cna	Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

CVSS scores (2)

Score	Severity	Version	Source	Vector
3.5	LOW	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N
2.3	LOW	4.0	cna	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

References (5)