CVE-2019-9557: Ability Mail Server 4.2.6 has Persistent Cross Site Scripting (XSS) via the body e-mail body

This month

MEDIUM 6.1DOWNGRADE

CVE-2019-9557 is a medium-severity flaw (CVSS 6.1) affecting ability mail server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Ability Mail Server 4.2.6 has Persistent Cross Site Scripting (XSS) via the body e-mail body. To exploit the vulnerability, the victim must open an email with malicious Javascript inserted into the body of the email as an iframe.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-03-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: codecrafters

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

Am I affected?

Timeline

2019-03-12 19:29 UTCPublished CVE record published
2026-06-17 02:43 UTCUpdated Record last modified

codecrafters ability mail server DOWNGRADE

Affected: 4.2.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.2.6

1. Check installed version

apt-cache policy ability-mail-server || rpm -q ability-mail-server || ability-mail-server --version

2. No fixed release: DOWNGRADE to a release before 4.2.6 (Debian / Ubuntu)

apt-cache madison ability-mail-server sudo apt install ability-mail-server=<VERSION_BEFORE_4.2.6> sudo apt-mark hold ability-mail-server

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

dnf --showduplicates list ability-mail-server sudo dnf downgrade ability-mail-server-<VERSION_BEFORE_4.2.6> sudo dnf versionlock add ability-mail-server

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-2019-9557?

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

Is CVE-2019-9557 being exploited?

CVE-2019-9557 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-2019-9557 affect?

CVE-2019-9557 affects ability mail server. Severity is medium (CVSS 6.1). Ability Mail Server 4.2.6 has Persistent Cross Site Scripting (XSS) via the body e-mail body. To exploit the vulnerability, the victim must open an email with malicious Javascript inserted into the body of the email as an iframe.

How urgent is CVE-2019-9557?

Priority 42/100. Public exploit reference

Related CVEs

CVE-2017-17752 MEDIUM 6.1 DOWNGRADE Ability Mail Server 3.3.2 has Cross Site Scripting (XSS) via the body of an e-mail message, with JavaScript co
CVE-2013-6162 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in Code-Crafters Ability Mail Server 3.1.1 allows remote attackers to

References

← Back to latest CVEs