CVE-2019-9147: Mailvelope prior to 3.1.0 is vulnerable to a clickjacking attack against the settings page

Q: How do I fix CVE-2019-9147?

mailvelope: upgrade to 3.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2019-9147 being exploited?

CVE-2019-9147 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-2019-9147 affect?

CVE-2019-9147 affects mailvelope. Severity is medium (CVSS 4.3). Mailvelope prior to 3.1.0 is vulnerable to a clickjacking attack against the settings page. As the settings page is intended to be accessible from web applications, the browser's extension isolation mechanisms are disabled (web_accessible_r

Q: How urgent is CVE-2019-9147?

Priority 33/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2019-9147 is a medium-severity flaw (CVSS 4.3) affecting mailvelope. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Mailvelope prior to 3.1.0 is vulnerable to a clickjacking attack against the settings page. As the settings page is intended to be accessible from web applications, the browser's extension isolation mechanisms are disabled (web_accessible_resources). Mailvelope implements additional measures to prevent web applications from directly embedding the settings page, but this mechanism can be bypassed.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-1021
Published	2019-07-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mailvelope

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

Am I affected?

Timeline

2019-07-09 21:15 UTCPublished CVE record published
2026-06-17 02:43 UTCUpdated Record last modified

mailvelope mailvelope UPGRADE

Affected: < 3.1.0

Fixed in: 3.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mailvelope

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mailvelope

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-2019-9147?

mailvelope: upgrade to 3.1.0. Exact commands for each OS are on this page.

Is CVE-2019-9147 being exploited?

CVE-2019-9147 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-2019-9147 affect?

CVE-2019-9147 affects mailvelope. Severity is medium (CVSS 4.3). Mailvelope prior to 3.1.0 is vulnerable to a clickjacking attack against the settings page. As the settings page is intended to be accessible from web applications, the browser's extension isolation mechanisms are disabled (web_accessible_r

How urgent is CVE-2019-9147?

Priority 33/100. No elevated risk signals yet.

Related CVEs

CVE-2019-9150 MEDIUM 5.3 UPGRADE Mailvelope prior to 3.3.0 does not require user interaction to import public keys shown on web page
CVE-2019-9149 MEDIUM 6.5 UPGRADE Mailvelope prior to 3.3.0 allows private key operations without user interaction via its client-API
CVE-2019-9148 MEDIUM 4.3 UPGRADE Mailvelope prior to 3.3.0 accepts or operates with invalid PGP public keys: Mailvelope allows importing keys t

References

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