CVE-2018-15667: An issue was discovered in Bloop Airmail 3 3.5.9 for macOS

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HIGH 7.5REMOTEDOWNGRADE

CVE-2018-15667 is a high-severity flaw (CVSS 7.5) affecting airmail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Bloop Airmail 3 3.5.9 for macOS. It registers and uses the airmail:// URL scheme. The "send" command in the URL scheme allows an external application to send arbitrary emails from an active account without authentication. The handler has no restriction on who can use its functionality. The handler can be invoked using any method that invokes the URL handler such as a hyperlink in an email. The user is not prompted when

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-287
Published	2018-08-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: airmailapp

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

Am I affected?

Timeline

2018-08-21 23:29 UTCPublished CVE record published
2026-06-17 01:42 UTCUpdated Record last modified

airmailapp airmail DOWNGRADE

Affected: 3.3.5.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.3.5.9

1. Check installed version

apt-cache policy airmail || rpm -q airmail || airmail --version

2. No fixed release: DOWNGRADE to a release before 3.3.5.9 (Debian / Ubuntu)

apt-cache madison airmail sudo apt install airmail=<VERSION_BEFORE_3.3.5.9> sudo apt-mark hold airmail

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list airmail sudo dnf downgrade airmail-<VERSION_BEFORE_3.3.5.9> sudo dnf versionlock add airmail

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2018-15667?

airmail: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-15667 being exploited?

CVE-2018-15667 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-2018-15667 affect?

CVE-2018-15667 affects airmail. Severity is high (CVSS 7.5). An issue was discovered in Bloop Airmail 3 3.5.9 for macOS. It registers and uses the airmail:// URL scheme. The "send" command in the URL scheme allows an external application to send arbitrary emails from an active account without authent

How urgent is CVE-2018-15667?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

Software pages

macOS vulnerabilities

Related CVEs

CVE-2018-15670 MEDIUM 4.3 DOWNGRADE An issue was discovered in Bloop Airmail 3 3.5.9 for macOS
CVE-2017-17689 MEDIUM 5.9 MITIGATE MITIGATE The S/MIME specification allows a Cipher Block Chaining (CBC) malleability-gadget attack that can indirectly l
CVE-2017-17688 MEDIUM 5.9 MITIGATE MITIGATE The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack that can indirectly l

References

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