CVE-2020-36326
CRITICAL
9.8
CVSS Score
Published: April 28, 2021 at 02:21 AM UTC
Updated: June 17, 2026 at 03:15 AM UTC
2 products affected across 2 vendorsWordPressPhpmailer
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Severity
CRITICAL9.8
Exploit prediction
EPSS 3%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
95%
6.1.8 ≤ v ≤ 6.4.0
WordPress· WordPressdrupal
95%3.7 ≤ v < 3.7.363.8 ≤ v < 3.8.363.9 ≤ v < 3.9.344.0 ≤ v < 4.0.334.1 ≤ v < 4.1.334.2 ≤ v < 4.2.304.3 ≤ v < 4.3.264.4 ≤ v < 4.4.254.5 ≤ v < 4.5.244.6 ≤ v < 4.6.214.7 ≤ v < 4.7.214.8 ≤ v < 4.8.174.9 ≤ v < 4.9.185.0 ≤ v < 5.0.135.1 ≤ v < 5.1.105.2 ≤ v < 5.2.115.3 ≤ v < 5.3.85.4 ≤ v < 5.4.65.5 ≤ v < 5.5.55.6 ≤ v < 5.6.45.7 ≤ v < 5.7.2
Affected range stops below 3.7.36, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.8.36, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.9.34, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.0.33, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.1.33, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.2.30, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.3.26, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.4.25, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.5.24, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.6.21, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.7.21, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.8.17, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.9.18, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.0.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.1.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.2.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.3.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.4.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.5.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.6.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.7.2, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://github.com/PHPMailer/PHPMailer/commit/e2e07a355ee8ff36aba21d0242c5950c56e4c6f9
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3B5WDPGUFNPG4NAZ6G4BZX43BKLAVA5B/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KPU66INRFY5BQ3ESVPRUXJR4DXQAFJVT/
References (3)
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/PHPMailer/PHPMailer/commit/e2e07a355ee8ff36aba21d0242c5950c56e4c6f9Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3B5WDPGUFNPG4NAZ6G4BZX43BKLAVA5B/Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KPU66INRFY5BQ3ESVPRUXJR4DXQAFJVT/CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-502
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