CVE-2018-15670: An issue was discovered in Bloop Airmail 3 3.5.9 for macOS

Routine

MEDIUM 4.3DOWNGRADE

CVE-2018-15670 is a medium-severity flaw (CVSS 4.3) 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. Its primary WebView instance implements "webView:decidePolicyForNavigationAction:request:frame:decisionListener:" such that OpenURL is the default URL handler. A navigation request is processed by the default URL handler only if the currentEvent is NX_LMOUSEUP or NX_OMOUSEUP. An attacker may abuse HTML elements with an EventHandler for a chance to validate navigation requests for URLs th

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-20
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 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-2018-15670?

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

Is CVE-2018-15670 being exploited?

CVE-2018-15670 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-2018-15670 affect?

CVE-2018-15670 affects airmail. Severity is medium (CVSS 4.3). 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 OpenURL is the default URL handler. A navigation request

How urgent is CVE-2018-15670?

Priority 29/100. No elevated risk signals yet.

Software pages

macOS vulnerabilities

Related CVEs

CVE-2018-15667 HIGH 7.5 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

← Back to latest CVEs