CVE-2025-27913: passbolt api — Fix

Description

Passbolt API before 5, if the server is misconfigured (with an incorrect installation process and disregarding of Health Check results), can send email messages with a domain name taken from an attacker-controlled HTTP Host header.

Is your site exposed to CVE-2025-27913?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

7.5

HIGH

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

Weakness Type (CWE)

CWE-348 CWE-348

Affected Products

Vendor	Product	Versions
passbolt	passbolt_api	< 5.0.0

References

Advisories & Patches

https://www.passbolt.com/incidents/host-header-injection

Frequently Asked Questions

What is CVE-2025-27913? +

Passbolt API before 5, if the server is misconfigured (with an incorrect installation process and disregarding of Health Check results), can send email messages with a domain name taken from an attacker-controlled HTTP Host header. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-27913? +

CVE-2025-27913 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-27913? +

CVE-2025-27913 affects products from passbolt, specifically: passbolt_api. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-27913? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-9561

Eclipse Kura versions prior to 5.6.2 trust the client-supplied X-Forwarded-For HTTP header as the authoritative source of the client IP …

CVE-2026-44183 9.8

Cleanuparr is a tool for automating the cleanup of unwanted or blocked files in Sonarr, Radarr, and supported download clients …

CVE-2024-45410 9.8

Traefik is a golang, Cloud Native Application Proxy. When a HTTP request is processed by Traefik, certain HTTP headers such …

CVE-2026-58122 9.1

Hermes WebUI before 0.51.307 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to circumvent local-origin IP restrictions on …

CVE-2025-48865 9.1

Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. Prior to version 1.6.6, Fabio allows clients …

CVE-2025-59951 9.1

Termix is a web-based server management platform with SSH terminal, tunneling, and file editing capabilities. The official Docker image for …

CVE-2025-27913