#VU82996 Cross-site scripting in Symfony - CVE-2023-46734

Vulnerability identifier: #VU82996

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-46734

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Symfony
Web applications / CMS

Vendor: SensioLabs

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in CodeExtension filters. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Symfony: 2.0.0PR8 - 5.4.30

---

External links
https://github.com/symfony/symfony/security/advisories/GHSA-q847-2q57-wmr3
https://github.com/symfony/symfony/commit/5d095d5feb1322b16450284a04d6bb48d1198f54
https://github.com/symfony/symfony/commit/9da9a145ce57e4585031ad4bee37c497353eec7c
https://github.com/symfony/symfony/releases/tag/v4.4.51
https://github.com/symfony/symfony/releases/tag/v5.4.31
https://github.com/symfony/symfony/releases/tag/v6.3.8

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.