How severe is CVE-2026-57522?

CVE-2026-57522 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-57522 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-57522?

CVE-2026-57522 affects Bitwarden Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-57522?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-57522 have an EU (EUVD) identifier?

Yes. CVE-2026-57522 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39543.

When was CVE-2026-57522 published?

CVE-2026-57522 was published on 2026-06-25 and last updated on 2026-06-27.

CVE-2026-57522

CVE-2026-57522 is a low-severity vulnerability in Bitwarden Server with a CVSS 3.x base score of 3.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-74.

Key facts

Severity: Low (CVSS 3.x base score 3.5)
CVSS v4: 2.3
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39543
Weakness: CWE-74
Affected product: Bitwarden Server
Published: 2026-06-25
Last modified: 2026-06-27

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.

Frequently asked questions

What is CVE-2026-57522?: 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.
How severe is CVE-2026-57522?: CVE-2026-57522 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-57522 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-57522?: CVE-2026-57522 affects Bitwarden Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-57522?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-57522 have an EU (EUVD) identifier?: Yes. CVE-2026-57522 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39543.
When was CVE-2026-57522 published?: CVE-2026-57522 was published on 2026-06-25 and last updated on 2026-06-27.

References

Affected products (1)

cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:*

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