CVE-2020-36326
Last modified
CVE-2020-36326 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. PHPMailer 6.1.8 through 6.4.0 allows object injection through Phar Deserialization via addAttachment with a UNC pathname. NOTE: this is similar to CVE-2018-19296, but arose because 6.1.8 fixed a functionality problem in which UNC pathnames were always considered unreadable by PHPMailer, even in safe contexts. EPSS estimates a 3.09% chance of exploitation in the next 30 days.
Description
PHPMailer 6.1.8 through 6.4.0 allows object injection through Phar Deserialization via addAttachment with a UNC pathname. NOTE: this is similar to CVE-2018-19296, but arose because 6.1.8 fixed a functionality problem in which UNC pathnames were always considered unreadable by PHPMailer, even in safe contexts. As an unintended side effect, this fix eliminated the code that blocked addAttachment exploitation.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Phpmailer Project | Phpmailer | >= 6.1.8, <= 6.4.0 |
| Wordpress | Wordpress | >= 3.7, < 3.7.36 |
| Wordpress | Wordpress | >= 3.8, < 3.8.36 |
| Wordpress | Wordpress | >= 3.9, < 3.9.34 |
| Wordpress | Wordpress | >= 4.0, < 4.0.33 |
| Wordpress | Wordpress | >= 4.1, < 4.1.33 |
| Wordpress | Wordpress | >= 4.2, < 4.2.30 |
| Wordpress | Wordpress | >= 4.3, < 4.3.26 |
| Wordpress | Wordpress | >= 4.4, < 4.4.25 |
| Wordpress | Wordpress | >= 4.5, < 4.5.24 |
| Wordpress | Wordpress | >= 4.6, < 4.6.21 |
| Wordpress | Wordpress | >= 4.7, < 4.7.21 |
| Wordpress | Wordpress | >= 4.8, < 4.8.17 |
| Wordpress | Wordpress | >= 4.9, < 4.9.18 |
| Wordpress | Wordpress | >= 5.0, < 5.0.13 |
| Wordpress | Wordpress | >= 5.1, < 5.1.10 |
| Wordpress | Wordpress | >= 5.2, < 5.2.11 |
| Wordpress | Wordpress | >= 5.3, < 5.3.8 |
| Wordpress | Wordpress | >= 5.4, < 5.4.6 |
| Wordpress | Wordpress | >= 5.5, < 5.5.5 |
| Wordpress | Wordpress | >= 5.6, < 5.6.4 |
| Wordpress | Wordpress | >= 5.7, < 5.7.2 |
References
- https://github.com/PHPMailer/PHPMailer/commit/e2e07a355ee8ff36aba21d0242c5950c56e4c6f9Patch, Third Party Advisory
- https://github.com/PHPMailer/PHPMailer/commit/e2e07a355ee8ff36aba21d0242c5950c56e4c6f9Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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