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Vulnerability details: VCID-d2jv-nfmb-ckgx
Vulnerability ID VCID-d2jv-nfmb-ckgx
Aliases CVE-2020-36326
GHSA-m298-fh5c-jc66
Summary Deserialization of Untrusted Data PHPMailer allows object injection through `Phar` deserialization via the `addAttachment` with a UNC pathname.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-502 Deserialization of Untrusted Data
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-641 Improper Restriction of Names for Files and Other Resources
System Score Found at
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2020-36326
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2020-36326
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2020-36326
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2020-36326
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-m298-fh5c-jc66
cvssv3.1 9.8 https://github.com/FriendsOfPHP/security-advisories/blob/master/phpmailer/phpmailer/CVE-2020-36326.yaml
generic_textual CRITICAL https://github.com/FriendsOfPHP/security-advisories/blob/master/phpmailer/phpmailer/CVE-2020-36326.yaml
cvssv3.1 9.8 https://github.com/PHPMailer/PHPMailer/commit/e2e07a355ee8ff36aba21d0242c5950c56e4c6f9
generic_textual CRITICAL https://github.com/PHPMailer/PHPMailer/commit/e2e07a355ee8ff36aba21d0242c5950c56e4c6f9
cvssv3.1 9.8 https://github.com/PHPMailer/PHPMailer/releases/tag/v6.4.1
generic_textual CRITICAL https://github.com/PHPMailer/PHPMailer/releases/tag/v6.4.1
cvssv3.1 9.8 https://github.com/PHPMailer/PHPMailer/security/advisories/GHSA-m298-fh5c-jc66
cvssv3.1_qr CRITICAL https://github.com/PHPMailer/PHPMailer/security/advisories/GHSA-m298-fh5c-jc66
generic_textual CRITICAL https://github.com/PHPMailer/PHPMailer/security/advisories/GHSA-m298-fh5c-jc66
cvssv3.1 9.8 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3B5WDPGUFNPG4NAZ6G4BZX43BKLAVA5B
generic_textual CRITICAL https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3B5WDPGUFNPG4NAZ6G4BZX43BKLAVA5B
cvssv3.1 9.8 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KPU66INRFY5BQ3ESVPRUXJR4DXQAFJVT
generic_textual CRITICAL https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KPU66INRFY5BQ3ESVPRUXJR4DXQAFJVT
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2020-36326
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2020-36326
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2020-36326
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36326
https://github.com/FriendsOfPHP/security-advisories/blob/master/phpmailer/phpmailer/CVE-2020-36326.yaml
https://github.com/PHPMailer/PHPMailer/commit/e2e07a355ee8ff36aba21d0242c5950c56e4c6f9
https://github.com/PHPMailer/PHPMailer/releases/tag/v6.4.1
https://github.com/PHPMailer/PHPMailer/security/advisories/GHSA-m298-fh5c-jc66
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3B5WDPGUFNPG4NAZ6G4BZX43BKLAVA5B
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3B5WDPGUFNPG4NAZ6G4BZX43BKLAVA5B/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KPU66INRFY5BQ3ESVPRUXJR4DXQAFJVT
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KPU66INRFY5BQ3ESVPRUXJR4DXQAFJVT/
988732 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988732
CVE-2020-36326 https://nvd.nist.gov/vuln/detail/CVE-2020-36326
GHSA-m298-fh5c-jc66 https://github.com/advisories/GHSA-m298-fh5c-jc66
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/phpmailer/phpmailer/CVE-2020-36326.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/PHPMailer/PHPMailer/commit/e2e07a355ee8ff36aba21d0242c5950c56e4c6f9
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/PHPMailer/PHPMailer/releases/tag/v6.4.1
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/PHPMailer/PHPMailer/security/advisories/GHSA-m298-fh5c-jc66
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3B5WDPGUFNPG4NAZ6G4BZX43BKLAVA5B
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KPU66INRFY5BQ3ESVPRUXJR4DXQAFJVT
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-36326
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.53929
EPSS Score 0.00304
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:21:07.220927+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/phpmailer/phpmailer/CVE-2020-36326.yml 38.6.0