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CRITICAL severity

CVE-2016-10074 — swiftmailer

CRITICAL

CVE-2016-10074 is a critical-severity (CVSS 9.8) CWE-77 vulnerability in swiftmailer/swiftmailer. 7 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for swiftmailer/swiftmailer — see the affected versions and patch details below.

Swift Mailer mail transport Command Injection

Also known asGHSA-pr44-4jfr-286m
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
7 known
Exploitation data as of Oct 29, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
43.8%probability of exploitation in next 30 days
High Risk+1.97%
Lower risk than most CVEs99th percentile — riskier than 99% of all scored CVEsHighest risk
31.7%49.7%67.7%85.6%75.5%43.8%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘swiftmailer/swiftmailer

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

The mail transport (aka Swift_Transport_MailTransport) in Swift Mailer before 5.4.5 might allow remote attackers to pass extra parameters to the mail command and consequently execute arbitrary code via a " (backslash double quote) in a crafted e-mail address in the (1) From, (2) ReturnPath, or (3) Sender header.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistswiftmailer/swiftmailerall versions5.4.5composer require swiftmailer/swiftmailer:^5.4.5

Affected Products

1 product · 1 configurations
Application
swiftmailerswiftmailer
≤ 5.4.4
range
Exploits & PoCs
7

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-42221webappsphp

PHPMailer < 5.2.20 with Exim MTA - Remote Code Execution

by phackt_ul · Jun 21, 2017

Exploit-DB Source
EDB-40986webappsphp

PHPMailer < 5.2.20 / SwiftMailer < 5.4.5-DEV / Zend Framework / zend-mail < 2.4.11 - 'AIO' 'PwnScriptum' Remote Code Execution

by Dawid Golunski · Jan 2, 2017

Exploit-DB Source
EDB-40972webappsphp

SwiftMailer < 5.4.5-DEV - Remote Code Execution

by Dawid Golunski · Dec 28, 2016

Exploit-DB Source

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for swiftmailer/swiftmailer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update swiftmailer/swiftmailer to 5.4.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2016-10074 is resolved across your whole dependency graph.

  3. Workarounds

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

The mail transport (aka Swift_Transport_MailTransport) in Swift Mailer before 5.4.5 might allow remote attackers to pass extra parameters to the mail command and consequently execute arbitrary code via a \" (backslash double quote) in a crafted e-mail address in the (1) From, (2) ReturnPath, or (3) Sender header.
O3 Security · Impact-Aware SCA

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CVE-2016-10074: swiftmailer RCE — Fixed in 5.4.5