# Phpmailer vulnerabilities > Phpmailer is made by Phpmailer Project. We track 10 published vulnerabilities in it, across 51 versions. 1 of them is on the list of flaws known to be exploited, the newest added on 7 July 2025. If you run Phpmailer, check your version against the exploited flaws below and patch those first. Canonical page: https://www.precursorintelligence.com/product/phpmailer_project/phpmailer ## At a glance - **Made by:** [Phpmailer Project](https://www.precursorintelligence.com/vendors/phpmailer_project) - **Published vulnerabilities:** 10 - **Known to be exploited:** 1 - **Versions tracked:** 51 - **Most recently added to the known-exploited list:** [CVE-2016-10033](https://www.precursorintelligence.com/what-is/cve-2016-10033), 7 July 2025. We keep watching the list. ## Which versions of Phpmailer do the exploited flaws hit? Each exploited flaw lists the versions it affects, as published. "before 5.2.18" means every version up to, but not including, 5.2.18. - [CVE-2016-10033](https://www.precursorintelligence.com/what-is/cve-2016-10033) (PHPMailer Command Injection Vulnerability): before 5.2.18 ## Which Phpmailer vulnerabilities are being exploited? 1 flaw is on the government list of vulnerabilities known to be exploited, newest first: - [CVE-2016-10033](https://www.precursorintelligence.com/what-is/cve-2016-10033): PHPMailer Command Injection Vulnerability. Critical, CVSS 9.8, chance of use in 30 days >99%, known exploited since 7 July 2025. ## Which Phpmailer flaws are most likely to be used? Ranked by the latest exploit-likelihood forecast (the chance each flaw is used in an attack in the next 30 days): - [CVE-2016-10033](https://www.precursorintelligence.com/what-is/cve-2016-10033): >99%, Critical (CVSS 9.8), known exploited - [CVE-2016-10045](https://www.precursorintelligence.com/what-is/cve-2016-10045): 98%, Critical (CVSS 9.8) - [CVE-2020-13625](https://www.precursorintelligence.com/what-is/cve-2020-13625): 3.8%, High (CVSS 7.5) - [CVE-2020-36326](https://www.precursorintelligence.com/what-is/cve-2020-36326): 3.1%, Critical (CVSS 9.8) - [CVE-2021-34551](https://www.precursorintelligence.com/what-is/cve-2021-34551): 2.8%, High (CVSS 8.1) - [CVE-2017-11503](https://www.precursorintelligence.com/what-is/cve-2017-11503): 2.4%, Medium (CVSS 6.1) - [CVE-2021-3603](https://www.precursorintelligence.com/what-is/cve-2021-3603): 2.3%, High (CVSS 8.1) - [CVE-2018-19296](https://www.precursorintelligence.com/what-is/cve-2018-19296): 2.2%, High (CVSS 8.8) - [CVE-2017-5223](https://www.precursorintelligence.com/what-is/cve-2017-5223): 2.1%, Medium (CVSS 5.5) - [CVE-2015-8476](https://www.precursorintelligence.com/what-is/cve-2015-8476): 2.0%, Medium (CVSS 5.0) ## Questions ### How many vulnerabilities does Phpmailer have? We track 10 published vulnerabilities listed under the name Phpmailer, across 51 versions. The most recent Phpmailer flaw added to the known-exploited list is CVE-2016-10033, on 7 July 2025. ### Which Phpmailer vulnerabilities are being exploited? 1 is on the list of flaws known to be exploited. The most recently added is CVE-2016-10033. ### Which versions of Phpmailer do the exploited flaws affect? Each flaw names its own versions, usually as ranges. The newest, CVE-2016-10033, affects before 5.2.18. The versions for every exploited flaw are listed on this page. ### How do I get alerts for Phpmailer? Create a Precursor Intelligence account and track Phpmailer. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook. ## Running Phpmailer? Precursor Intelligence keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact