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Vulnerability details: VCID-kqcd-f4vt-r7g8
Vulnerability ID VCID-kqcd-f4vt-r7g8
Aliases CVE-2021-41268
GHSA-qw36-p97w-vcqr
Summary Session Fixation `Symfony/SecurityBundle` is the security system for Symfony, a PHP framework for web and console applications and a set of reusable PHP components. Since the rework of the Remember me cookie, the cookie is not invalidated when the user changes their password. Attackers can therefore maintain their access to the account even if the password is changed as long as they have had the chance to login once and get a valid remember me cookie. Starting with, Symfony makes the password part of the signature by default. In that way, when the password changes, then the cookie is not valid anymore.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-384 Session Fixation
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00476 https://api.first.org/data/v1/epss?cve=CVE-2021-41268
epss 0.00476 https://api.first.org/data/v1/epss?cve=CVE-2021-41268
epss 0.00476 https://api.first.org/data/v1/epss?cve=CVE-2021-41268
epss 0.00476 https://api.first.org/data/v1/epss?cve=CVE-2021-41268
epss 0.00476 https://api.first.org/data/v1/epss?cve=CVE-2021-41268
epss 0.00476 https://api.first.org/data/v1/epss?cve=CVE-2021-41268
epss 0.00476 https://api.first.org/data/v1/epss?cve=CVE-2021-41268
epss 0.00476 https://api.first.org/data/v1/epss?cve=CVE-2021-41268
epss 0.00476 https://api.first.org/data/v1/epss?cve=CVE-2021-41268
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-qw36-p97w-vcqr
cvssv3.1 6.5 https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-bundle/CVE-2021-41268.yaml
generic_textual MODERATE https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-bundle/CVE-2021-41268.yaml
cvssv3.1 6.5 https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2021-41268.yaml
generic_textual MODERATE https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2021-41268.yaml
cvssv3.1 6.5 https://github.com/symfony/symfony
generic_textual MODERATE https://github.com/symfony/symfony
cvssv3.1 6.5 https://github.com/symfony/symfony/commit/36a808b857cd3240244f4b224452fb1e70dc6dfc
generic_textual MODERATE https://github.com/symfony/symfony/commit/36a808b857cd3240244f4b224452fb1e70dc6dfc
cvssv3.1 6.5 https://github.com/symfony/symfony/pull/44243
generic_textual MODERATE https://github.com/symfony/symfony/pull/44243
cvssv3.1 6.5 https://github.com/symfony/symfony/releases/tag/v5.3.12
generic_textual MODERATE https://github.com/symfony/symfony/releases/tag/v5.3.12
cvssv3.1 6.5 https://github.com/symfony/symfony/security/advisories/GHSA-qw36-p97w-vcqr
cvssv3.1_qr MODERATE https://github.com/symfony/symfony/security/advisories/GHSA-qw36-p97w-vcqr
generic_textual MODERATE https://github.com/symfony/symfony/security/advisories/GHSA-qw36-p97w-vcqr
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-41268
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-41268
cvssv3.1 6.5 https://symfony.com/cve-2021-41268
generic_textual MODERATE https://symfony.com/cve-2021-41268
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-41268
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-bundle/CVE-2021-41268.yaml
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2021-41268.yaml
https://github.com/symfony/symfony
https://github.com/symfony/symfony/commit/36a808b857cd3240244f4b224452fb1e70dc6dfc
https://github.com/symfony/symfony/pull/44243
https://github.com/symfony/symfony/releases/tag/v5.3.12
https://symfony.com/cve-2021-41268
CVE-2021-41268 https://nvd.nist.gov/vuln/detail/CVE-2021-41268
GHSA-qw36-p97w-vcqr https://github.com/advisories/GHSA-qw36-p97w-vcqr
GHSA-qw36-p97w-vcqr https://github.com/symfony/symfony/security/advisories/GHSA-qw36-p97w-vcqr
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-bundle/CVE-2021-41268.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:L/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2021-41268.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:L/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/symfony/symfony
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:L/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/symfony/symfony/commit/36a808b857cd3240244f4b224452fb1e70dc6dfc
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:L/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/symfony/symfony/pull/44243
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:L/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/symfony/symfony/releases/tag/v5.3.12
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:L/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/symfony/symfony/security/advisories/GHSA-qw36-p97w-vcqr
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:L/UI:N/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-41268
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:L/UI:N/S:U/C:H/I:N/A:N Found at https://symfony.com/cve-2021-41268
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 0.64778
EPSS Score 0.00476
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:49:06.610982+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/symfony/security-http/CVE-2021-41268.yml 38.0.0