Stored cross-site scripting in Symfony - CVE-2026-48761
Published: June 3, 2026
Vulnerability identifier: #VU133285
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-48761
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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 UrlAttributeSanitizer. A remote attacker can inject 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.
Affected software
Symfony
Debian Linux
symfony (Debian package)
Debian Linux
symfony (Debian package)
How to mitigate CVE-2026-48761
Install updates from vendor's website.
Symfony - addressed in versions 6.4.41, 7.4.13, 8.0.13
symfony (Debian package) - update to 6.4.41+dfsg-0+deb13u1
symfony (Debian package) - update to 6.4.41+dfsg-0+deb13u1