CVE-2025-27913: Passbolt API before 5, if the server is misconfigured (with an incorrect installation process and disregarding

Q: How do I fix CVE-2025-27913?

passbolt api: upgrade to 5.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-27913 being exploited?

CVE-2025-27913 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-27913 affect?

CVE-2025-27913 affects passbolt api. Severity is high (CVSS 7.5). 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.

Q: How urgent is CVE-2025-27913?

Priority 33/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2025-27913 is a high-severity flaw (CVSS 7.5) affecting passbolt api. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-348
Published	2025-03-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: passbolt

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-03-10 20:15 UTCPublished CVE record published
2026-06-17 09:04 UTCUpdated Record last modified

passbolt passbolt api UPGRADE

Affected: < 5.0.0

Fixed in: 5.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy passbolt-api || rpm -q passbolt-api || passbolt-api --version

2. UPGRADE to 5.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade passbolt-api

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade passbolt-api

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-27913?

passbolt api: upgrade to 5.0.0. Exact commands for each OS are on this page.

Is CVE-2025-27913 being exploited?

CVE-2025-27913 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-27913 affect?

CVE-2025-27913 affects passbolt api. Severity is high (CVSS 7.5). 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.

How urgent is CVE-2025-27913?

Priority 33/100. High severity; Remotely exploitable, no login, no user action

References

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