Downstream event-data injection via raw token substitution
Published Jun 25, 2026 · Updated Jun 25, 2026
JSON injection in Bitwarden Server before 2026.5.0 allows remote authenticated users to add fields to event-integration payloads. IntegrationTemplateProcessor.ReplaceTokens() converts matched properties to strings and inserts them into JSON templates without encoding metacharacters. The integration feature was not user-exposed at disclosure and required manual database setup; organization membership, a member-controlled name token, and an event trigger then let injected fields reach downstream consumers as legitimate data.
Summary
What happened
JSON injection in Bitwarden Server before 2026.5.0 allows remote authenticated users to add fields to event-integration payloads. IntegrationTemplateProcessor.ReplaceTokens() converts matched properties to strings and inserts them into JSON templates without encoding metacharacters. The integration feature was not user-exposed at disclosure and required manual database setup; organization membership, a member-controlled name token, and an event trigger then let injected fields reach downstream consumers as legitimate data.
The record
- CVE
- CVE-2026-57522
- Published
- Jun 25, 2026
- Updated
- Jun 25, 2026
- Vendor
- Bitwarden
- Product
- Bitwarden Server
- Classifications
- CWE-74, T1565.002
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 25, 2026CVE publishedPublication date reported by the CVE source.
- Jun 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <2026.5.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Bitwarden webhook JSON injection demonstrationproof of concept · validated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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