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CVE-2024-51996

Symphony has an Authentication Bypass via RememberMe

7.5 HighPublic exploitFix available

Symphony process is a module for the Symphony PHP framework which executes commands in sub-processes. When consuming a persisted remember-me cookie, Symfony does not check if the username persisted in the database matches the username attached with the cookie, leading to authentication bypass. This vulnerability is fixed in 5.4.47, 6.4.15, and 7.1.8.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.62%Up 0.6 points since Nov 14, 2024
90%50%10%1%

What each source reports

CVE List Score used 7.5

Symphony has an Authentication Bypass via RememberMe

Symphony process is a module for the Symphony PHP framework which executes commands in sub-processes. When consuming a persisted remember-me cookie, Symfony does not check if the username persisted in the database matches the username attached with the cookie, leading to authentication bypass. This vulnerability is fixed in 5.4.47, 6.4.15, and 7.1.8.

Record
CVE-2024-51996
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-287, CWE-289
Updated
2026-11-02
EUVDEUVD-2024-3234 7.5

Symphony process is a module for the Symphony PHP framework which executes commands in sub-processes. When consuming a persisted remember-me cookie, Symfony does not check if the username persisted in the database matches the username attached with the cookie, leading to authentication bypass. This vulnerability is fixed in 5.4.47, 6.4.15, and 7.1.8.

Record
EUVD-2024-3234
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-cg23-qf8f-62rr 8.7

Symfony has an Authentication Bypass via RememberMe

Description

When consuming a persisted remember-me cookie, Symfony does not check if the username persisted in the database matches the username attached with the cookie, leading to authentication bypass.

Resolution

The PersistentRememberMeHandler class now ensures the submitted username is the cookie owner.

The patch for this issue is available here for branch 5.4.

Credits

We would like to thank Moritz Rauch - Pentryx AG for reporting the issue and Jérémy Derussé for providing the fix.

Record
GHSA-cg23-qf8f-62rr
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-287, CWE-289
Updated
2026-11-02
NVD 7.5

Symphony process is a module for the Symphony PHP framework which executes commands in sub-processes. When consuming a persisted remember-me cookie, Symfony does not check if the username persisted in the database matches the username attached with the cookie, leading to authentication bypass. This vulnerability is fixed in 5.4.47, 6.4.15, and 7.1.8.

Record
CVE-2024-51996
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-287, CWE-289
Updated
2026-11-02
OSV 7.5

Symphony has an Authentication Bypass via RememberMe

Symphony process is a module for the Symphony PHP framework which executes commands in sub-processes. When consuming a persisted remember-me cookie, Symfony does not check if the username persisted in the database matches the username attached with the cookie, leading to authentication bypass. This vulnerability is fixed in 5.4.47, 6.4.15, and 7.1.8.

Record
CVE-2024-51996
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-287, CWE-289
Updated
2026-11-02
OSVDEBIAN-CVE-2024-51996 7.5

Symphony process is a module for the Symphony PHP framework which executes commands in sub-processes. When consuming a persisted remember-me cookie, Symfony does not check if the username persisted in the database matches the username attached with the cookie, leading to authentication bypass. This vulnerability is fixed in 5.4.47, 6.4.15, and 7.1.8.

Record
DEBIAN-CVE-2024-51996
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVGHSA-cg23-qf8f-62rr 8.7

Symfony has an Authentication Bypass via RememberMe

Description

When consuming a persisted remember-me cookie, Symfony does not check if the username persisted in the database matches the username attached with the cookie, leading to authentication bypass.

Resolution

The PersistentRememberMeHandler class now ensures the submitted username is the cookie owner.

The patch for this issue is available here for branch 5.4.

Credits

We would like to thank Moritz Rauch - Pentryx AG for reporting the issue and Jérémy Derussé for providing the fix.

Record
GHSA-cg23-qf8f-62rr
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-287, CWE-289
Updated
2026-11-02
OSVUBUNTU-CVE-2024-51996 7.5

Symphony process is a module for the Symphony PHP framework which executes commands in sub-processes. When consuming a persisted remember-me cookie, Symfony does not check if the username persisted in the database matches the username attached with the cookie, leading to authentication bypass. This vulnerability is fixed in 5.4.47, 6.4.15, and 7.1.8.

Record
UBUNTU-CVE-2024-51996
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVUSN-7272-1 No score

symfony vulnerabilities

Soner Sayakci discovered that Symfony incorrectly handled cookie storage in the web cache. An attacker could possibly use this issue to obtain sensitive information and access unauthorized resources. (CVE-2022-24894)

Marco Squarcina discovered that Symfony incorrectly handled the storage of user session information. An attacker could possibly use this issue to perform a cross-site request forgery (CSRF) attack. (CVE-2022-24895)

Pierre Rudloff discovered that Symfony incorrectly checked HTML input. An attacker could possibly use this issue to perform cross site scripting. (CVE-2023-46734)

Vladimir Dusheyko discovered that Symfony incorrectly sanitized special input with a PHP directive in URL query strings. An attacker could possibly use this issue to expose sensitive information or cause a denial of service. This issue only affected Ubuntu 24.04 LTS and Ubuntu 22.04 LTS. (CVE-2024-50340)

Oleg Andreyev, Antoine Makdessi, and Moritz Rauch discovered that Symfony incorrectly handled user authentication. An attacker could possibly use this issue to access unauthorized resources and expose sensitive information. This issue was only addressed in Ubuntu 24.04 LTS. (CVE-2024-50341, CVE-2024-51996)

Linus Karlsson and Chris Smith discovered that Symfony returned internal host information during host resolution. An attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 24.04 LTS and Ubuntu 22.04 LTS. (CVE-2024-50342)

It was discovered that Symfony incorrectly parsed user input through regular expressions. An attacker could possibly use this issue to expose sensitive information. (CVE-2024-50343)

Sam Mush discovered that Symfony incorrectly parsed URIs with special characters. An attacker could possibly use this issue to perform phishing attacks. (CVE-2024-50345)

Record
USN-7272-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
symfony/security-http
Packagist
5.3.0 up to 5.4.47
5.4.47
symfony/security-http
Packagist
6.0.0-BETA1 up to 6.4.15
6.4.15
symfony/security-http
Packagist
7.0.0-BETA1 up to 7.1.8
7.1.8
symfony
Debian:12
before 5.4.23+dfsg-1+deb12u4, plus listed versions
5.4.23+dfsg-15.4.23+dfsg-1+deb12u15.4.23+dfsg-1+deb12u25.4.23+dfsg-1+deb12u3
5.4.23+dfsg-1+deb12u4
symfony
Debian:13
before 6.4.15+dfsg-1
6.4.15+dfsg-1
symfony
Debian:14
before 6.4.15+dfsg-1
6.4.15+dfsg-1
symfony/security-http
Packagist
5.3.0 up to 5.4.47, plus listed versions
v5.3.0v5.3.1v5.3.10v5.3.11v5.3.13
Show 41 moreShow less
v5.3.14v5.3.2v5.3.3v5.3.4v5.3.6v5.3.7v5.3.8v5.4.0v5.4.0-BETA1v5.4.0-BETA2v5.4.0-RC1v5.4.10v5.4.11v5.4.12v5.4.13v5.4.15v5.4.17v5.4.19v5.4.2v5.4.20v5.4.21v5.4.22v5.4.23v5.4.26v5.4.28v5.4.3v5.4.30v5.4.31v5.4.35v5.4.36v5.4.38v5.4.39v5.4.40v5.4.41v5.4.43v5.4.44v5.4.45v5.4.46v5.4.5v5.4.8v5.4.9
5.4.47
symfony/security-http
Packagist
6.0.0-BETA1 up to 6.4.15, plus listed versions
v6.0.0v6.0.0-BETA1v6.0.0-BETA2v6.0.0-RC1v6.0.1
Show 45 moreShow less
v6.0.10v6.0.11v6.0.12v6.0.13v6.0.14v6.0.15v6.0.17v6.0.19v6.0.2v6.0.20v6.0.3v6.0.5v6.0.7v6.0.8v6.0.9v6.1.0v6.1.0-BETA1v6.1.0-BETA2v6.1.0-RC1v6.1.1v6.1.11v6.1.12v6.1.2v6.1.3v6.1.4v6.1.5v6.1.6v6.1.7v6.1.9v6.2.0v6.2.0-BETA1v6.2.0-BETA3v6.2.0-RC1v6.2.10v6.2.11v6.2.13v6.2.2v6.2.5v6.2.6v6.2.7v6.2.8v6.3.0v6.3.0-BETA1v6.3.0-RC1v6.3.1
6.4.15
symfony/security-http
Packagist
7.0.0-BETA1 up to 7.1.8, plus listed versions
v7.0.0v7.0.0-BETA1v7.0.0-BETA3v7.0.0-RC1v7.0.0-RC2
Show 16 moreShow less
v7.0.1v7.0.3v7.0.4v7.0.7v7.0.8v7.0.9v7.1.0v7.1.0-BETA1v7.1.0-RC1v7.1.1v7.1.2v7.1.3v7.1.4v7.1.5v7.1.6v7.1.7
7.1.8
symfony
Ubuntu:22.04:LTS
All versions, plus listed versions
5.2.6+dfsg-1ubuntu75.4.4+dfsg-1ubuntu8
None known
Show 6 moreShow less
Affected packages
PackageAffectedFixed
symfony
Ubuntu:Pro:24.04:LTS
before 6.4.5+dfsg-3ubuntu3+esm1, plus listed versions
5.4.23+dfsg-1ubuntu15.4.35+dfsg-3ubuntu16.4.5+dfsg-3ubuntu26.4.5+dfsg-3ubuntu3
6.4.5+dfsg-3ubuntu3+esm1
symfony
Ubuntu:25.10
All versions, plus listed versions
6.4.18+dfsg-1ubuntu16.4.21+dfsg-26.4.21+dfsg-2ubuntu16.4.24+dfsg-1
None known
symfony
Ubuntu:26.04:LTS
All versions, plus listed versions
6.4.24+dfsg-17.4.5+dfsg-1ubuntu17.4.6+dfsg-2ubuntu17.4.7+dfsg-1ubuntu1
None known
symfony
Ubuntu:Pro:20.04:LTS
From an advisory covering 9 CVEs
before 4.3.8+dfsg-1ubuntu1+esm2, plus listed versions
4.3.4+dfsg-1ubuntu14.3.8+dfsg-1ubuntu14.3.8+dfsg-1ubuntu1+esm1
4.3.8+dfsg-1ubuntu1+esm2
symfony
Ubuntu:Pro:22.04:LTS
From an advisory covering 9 CVEs
before 5.4.4+dfsg-1ubuntu8+esm1, plus listed versions
5.2.6+dfsg-1ubuntu75.4.4+dfsg-1ubuntu8
5.4.4+dfsg-1ubuntu8+esm1
symfony
Ubuntu:Pro:24.04:LTS
From an advisory covering 9 CVEs
before 6.4.5+dfsg-3ubuntu3+esm1, plus listed versions
5.4.23+dfsg-1ubuntu15.4.35+dfsg-3ubuntu16.4.5+dfsg-3ubuntu26.4.5+dfsg-3ubuntu3
6.4.5+dfsg-3ubuntu3+esm1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubmoften/CVE-2024-519962025-04-14

History

History
RecordedChangedSources
affected, facts
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-51996 is a high vulnerability (CVSS 7.5) in Symfony, published November 13, 2024. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.62%, the 49th percentile. Fixed in symfony/security-http 5.4.47.

References

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