CVE-2018-15669: An issue was discovered in Bloop Airmail 3 3.5.9 for macOS

Routine

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2018-15669 is a medium-severity flaw (CVSS 5.3) affecting airmail 3. 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. Its primary WebView instance implements "webView:decidePolicyForNavigationAction:request:frame:decisionListener:" such that requests from HTMLIFrameElements are blacklisted. However, other sub-classes of HTMLFrameOwnerElements are not forbidden by the policy. An attacker may abuse HTML plug-in elements within an email to trigger frame navigation requests that bypass this filter.

Why this priority

Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Published	2018-08-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: bloop

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

bloop airmail 3 DOWNGRADE

Affected: 3.5.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.5.9

1. Check installed version

apt-cache policy airmail-3 || rpm -q airmail-3 || airmail-3 --version

2. No fixed release: DOWNGRADE to a release before 3.5.9 (Debian / Ubuntu)

apt-cache madison airmail-3 sudo apt install airmail-3=<VERSION_BEFORE_3.5.9> sudo apt-mark hold airmail-3

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

dnf --showduplicates list airmail-3 sudo dnf downgrade airmail-3-<VERSION_BEFORE_3.5.9> sudo dnf versionlock add airmail-3

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-2018-15669?

airmail 3: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-15669 being exploited?

CVE-2018-15669 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-2018-15669 affect?

CVE-2018-15669 affects airmail 3. Severity is medium (CVSS 5.3). An issue was discovered in Bloop Airmail 3 3.5.9 for macOS. Its primary WebView instance implements "webView:decidePolicyForNavigationAction:request:frame:decisionListener:" such that requests from HTMLIFrameElements are blacklisted. Howeve

How urgent is CVE-2018-15669?

Priority 38/100. Remotely exploitable, no login, no user action

Software pages

macOS vulnerabilities

Related CVEs

CVE-2018-15668 MEDIUM 5.3 DOWNGRADE An issue was discovered in Bloop Airmail 3 3.5.9 for macOS

References

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