Is CVE-2018-15670 actively exploited?

No active exploitation of CVE-2018-15670 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-15670 be exploited remotely?

Yes. CVE-2018-15670 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2018-15670?

CVE-2018-15670 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2018-15670

CWE-20Published: August 21, 2018· Updated: Jun 17, 2026

4.3

CVSS v3.1

Official Description

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 that are processed during the NX_LMOUSEUP event triggered by clicking an email.

NVD Source

Technical Analysis

CVE-2018-15670 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.