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CVE-2020-36326

CRITICALCVSS 9.8/10EPSS 3.09%

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
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
3.09%

86.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
Phpmailer ProjectPhpmailer>= 6.1.8, <= 6.4.0
WordpressWordpress>= 3.7, < 3.7.36
WordpressWordpress>= 3.8, < 3.8.36
WordpressWordpress>= 3.9, < 3.9.34
WordpressWordpress>= 4.0, < 4.0.33
WordpressWordpress>= 4.1, < 4.1.33
WordpressWordpress>= 4.2, < 4.2.30
WordpressWordpress>= 4.3, < 4.3.26
WordpressWordpress>= 4.4, < 4.4.25
WordpressWordpress>= 4.5, < 4.5.24
WordpressWordpress>= 4.6, < 4.6.21
WordpressWordpress>= 4.7, < 4.7.21
WordpressWordpress>= 4.8, < 4.8.17
WordpressWordpress>= 4.9, < 4.9.18
WordpressWordpress>= 5.0, < 5.0.13
WordpressWordpress>= 5.1, < 5.1.10
WordpressWordpress>= 5.2, < 5.2.11
WordpressWordpress>= 5.3, < 5.3.8
WordpressWordpress>= 5.4, < 5.4.6
WordpressWordpress>= 5.5, < 5.5.5
WordpressWordpress>= 5.6, < 5.6.4
WordpressWordpress>= 5.7, < 5.7.2

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-36326?
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.
How severe is CVE-2020-36326?
CVE-2020-36326 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.09% probability of exploitation in the next 30 days.
How do I fix CVE-2020-36326?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-36326?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST