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Vulnerability details: VCID-xmrr-2jyf-5yhj
Vulnerability ID VCID-xmrr-2jyf-5yhj
Aliases CVE-2021-26120
GHSA-3rpf-5rqv-689q
Summary Code Injection Smarty allows code injection via an unexpected function name after a `{function name=` substring.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-94 Improper Control of Generation of Code ('Code Injection')
System Score Found at
epss 0.7558 https://api.first.org/data/v1/epss?cve=CVE-2021-26120
epss 0.7558 https://api.first.org/data/v1/epss?cve=CVE-2021-26120
epss 0.7558 https://api.first.org/data/v1/epss?cve=CVE-2021-26120
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-3rpf-5rqv-689q
cvssv3.1 9.8 https://github.com/FriendsOfPHP/security-advisories/blob/master/smarty/smarty/CVE-2021-26120.yaml
generic_textual CRITICAL https://github.com/FriendsOfPHP/security-advisories/blob/master/smarty/smarty/CVE-2021-26120.yaml
cvssv3.1 9.8 https://github.com/smarty-php/smarty
generic_textual CRITICAL https://github.com/smarty-php/smarty
cvssv3.1 9.8 https://github.com/smarty-php/smarty/blob/master/CHANGELOG.md
generic_textual CRITICAL https://github.com/smarty-php/smarty/blob/master/CHANGELOG.md
cvssv3.1 9.8 https://github.com/smarty-php/smarty/blob/master/CHANGELOG.md#3139---2021-02-17
generic_textual CRITICAL https://github.com/smarty-php/smarty/blob/master/CHANGELOG.md#3139---2021-02-17
cvssv3.1 9.8 https://github.com/smarty-php/smarty/commit/165f1bd4d2eec328cfeaca517a725b46001de838
generic_textual CRITICAL https://github.com/smarty-php/smarty/commit/165f1bd4d2eec328cfeaca517a725b46001de838
cvssv3.1 9.8 https://github.com/smarty-php/smarty/security/advisories/GHSA-3rpf-5rqv-689q
cvssv3.1_qr CRITICAL https://github.com/smarty-php/smarty/security/advisories/GHSA-3rpf-5rqv-689q
generic_textual CRITICAL https://github.com/smarty-php/smarty/security/advisories/GHSA-3rpf-5rqv-689q
cvssv3.1 9.8 https://lists.debian.org/debian-lts-announce/2021/04/msg00004.html
generic_textual CRITICAL https://lists.debian.org/debian-lts-announce/2021/04/msg00004.html
cvssv3.1 9.8 https://lists.debian.org/debian-lts-announce/2021/04/msg00014.html
generic_textual CRITICAL https://lists.debian.org/debian-lts-announce/2021/04/msg00014.html
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2021-26120
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2021-26120
cvssv3.1 9.8 https://security.gentoo.org/glsa/202105-06
generic_textual CRITICAL https://security.gentoo.org/glsa/202105-06
cvssv3.1 9.8 https://srcincite.io/blog/2021/02/18/smarty-template-engine-multiple-sandbox-escape-vulnerabilities.html
generic_textual CRITICAL https://srcincite.io/blog/2021/02/18/smarty-template-engine-multiple-sandbox-escape-vulnerabilities.html
cvssv3.1 9.8 https://www.debian.org/security/2022/dsa-5151
generic_textual CRITICAL https://www.debian.org/security/2022/dsa-5151
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-26120
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26120
https://github.com/FriendsOfPHP/security-advisories/blob/master/smarty/smarty/CVE-2021-26120.yaml
https://github.com/smarty-php/smarty
https://github.com/smarty-php/smarty/blob/master/CHANGELOG.md
https://github.com/smarty-php/smarty/blob/master/CHANGELOG.md#3139---2021-02-17
https://github.com/smarty-php/smarty/commit/165f1bd4d2eec328cfeaca517a725b46001de838
https://github.com/smarty-php/smarty/security/advisories/GHSA-3rpf-5rqv-689q
https://lists.debian.org/debian-lts-announce/2021/04/msg00004.html
https://lists.debian.org/debian-lts-announce/2021/04/msg00014.html
https://security.gentoo.org/glsa/202105-06
https://srcincite.io/blog/2021/02/18/smarty-template-engine-multiple-sandbox-escape-vulnerabilities.html
https://www.debian.org/security/2022/dsa-5151
CVE-2021-26120 https://nvd.nist.gov/vuln/detail/CVE-2021-26120
GHSA-3rpf-5rqv-689q https://github.com/advisories/GHSA-3rpf-5rqv-689q
USN-5348-1 https://usn.ubuntu.com/5348-1/
USN-USN-5348-2 https://usn.ubuntu.com/USN-5348-2/
USN-USN-5348-3 https://usn.ubuntu.com/USN-5348-3/
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/smarty/smarty/CVE-2021-26120.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

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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/smarty-php/smarty
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

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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/smarty-php/smarty/blob/master/CHANGELOG.md
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

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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/smarty-php/smarty/blob/master/CHANGELOG.md#3139---2021-02-17
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

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required

unchanged

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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/smarty-php/smarty/commit/165f1bd4d2eec328cfeaca517a725b46001de838
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

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high

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none

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none

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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/smarty-php/smarty/security/advisories/GHSA-3rpf-5rqv-689q
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

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none

required

unchanged

changed

high

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none

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none

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://lists.debian.org/debian-lts-announce/2021/04/msg00004.html
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

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none

required

unchanged

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none

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://lists.debian.org/debian-lts-announce/2021/04/msg00014.html
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

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none

required

unchanged

changed

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none

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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-2021-26120
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://security.gentoo.org/glsa/202105-06
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://srcincite.io/blog/2021/02/18/smarty-template-engine-multiple-sandbox-escape-vulnerabilities.html
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://www.debian.org/security/2022/dsa-5151
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

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none

required

unchanged

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none

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Exploit Prediction Scoring System (EPSS)
Percentile 0.98916
EPSS Score 0.7558
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:20:49.523417+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/smarty/smarty/CVE-2021-26120.yml 38.6.0