Malicious email links via Host header fallback
Published Mar 10, 2025 · Updated Mar 11, 2025
Host header injection in Passbolt API before 5 allows remote attackers to place attacker-chosen domains in generated email links. When App.fullBaseUrl is unset, the URL Router falls back to PHP's HTTP_HOST value, which can derive directly from the request's Host header. Exposure requires a misconfigured server and an unauthenticated email-generating endpoint; further exploitation requires a recipient to click the malicious link.
Summary
What happened
Host header injection in Passbolt API before 5 allows remote attackers to place attacker-chosen domains in generated email links. When App.fullBaseUrl is unset, the URL Router falls back to PHP's HTTP_HOST value, which can derive directly from the request's Host header. Exposure requires a misconfigured server and an unauthenticated email-generating endpoint; further exploitation requires a recipient to click the malicious link.
The record
- CVE
- CVE-2025-27913
- Published
- Mar 10, 2025
- Updated
- Mar 11, 2025
- Vendor
- Passbolt
- Product
- Passbolt API
- Classifications
- CWE-348, T1566.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 10, 2025CVE publishedPublication date reported by the CVE source.
- Mar 11, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <5
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.
Public exploit references
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Technologies
Your stack
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Your stack
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