CVE-2019-9149: Mailvelope prior to 3.3.0 allows private key operations without user interaction via its client-API

Q: How do I fix CVE-2019-9149?

mailvelope: upgrade to 3.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2019-9149 being exploited?

CVE-2019-9149 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-2019-9149 affect?

CVE-2019-9149 affects mailvelope. Severity is medium (CVSS 6.5). Mailvelope prior to 3.3.0 allows private key operations without user interaction via its client-API. By modifying an URL parameter in Mailvelope, an attacker is able to sign (and encrypt) arbitrary messages with Mailvelope, assuming the pri

Q: How urgent is CVE-2019-9149?

Priority 48/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 6.5REMOTEUPGRADE

CVE-2019-9149 is a medium-severity flaw (CVSS 6.5) affecting mailvelope. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Mailvelope prior to 3.3.0 allows private key operations without user interaction via its client-API. By modifying an URL parameter in Mailvelope, an attacker is able to sign (and encrypt) arbitrary messages with Mailvelope, assuming the private key password is cached. A second vulnerability allows an attacker to decrypt an arbitrary message when the GnuPG backend is used in Mailvelope.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (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
Weakness	CWE-347, CWE-863
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: < 3.3.0

Fixed in: 3.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.3.0 (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-2019-9149?

mailvelope: upgrade to 3.3.0. Exact commands for each OS are on this page.

Is CVE-2019-9149 being exploited?

CVE-2019-9149 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-2019-9149 affect?

CVE-2019-9149 affects mailvelope. Severity is medium (CVSS 6.5). Mailvelope prior to 3.3.0 allows private key operations without user interaction via its client-API. By modifying an URL parameter in Mailvelope, an attacker is able to sign (and encrypt) arbitrary messages with Mailvelope, assuming the pri

How urgent is CVE-2019-9149?

Priority 48/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

GnuPG vulnerabilities

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-2019-9148 MEDIUM 4.3 UPGRADE Mailvelope prior to 3.3.0 accepts or operates with invalid PGP public keys: Mailvelope allows importing keys t
CVE-2019-9147 MEDIUM 4.3 UPGRADE Mailvelope prior to 3.1.0 is vulnerable to a clickjacking attack against the settings page

References

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