CVE-2017-18343

6.1 mediumEPSS 6.1%

The debug handler in Symfony before v2.7.33, 2.8.x before v2.8.26, 3.x before v3.2.13, and 3.3.x before v3.3.6 has XSS via an array key during exception pretty printing in ExceptionHandler.php, as demonstrated by a /_debugbar/open?op=get URI. NOTE: the vendor's position is that this is not a vulnerability because the debug tools are not intended for production use. NOTE: the Symfony Debug component is used by Laravel Debugbar

Severity

CVSS 3.0

6.1 medium

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 6.1% chance of exploitation in the next 30 days; higher than 93% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2018-07-20
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

sensiolabs:symfony

References

https://github.com/barryvdh/laravel-debugbar/issues/850
https://github.com/symfony/debug/pull/7/commits/e48bda29143bd1a83001780b4a78e483822d985c
https://github.com/symfony/symfony/issues/27987
https://github.com/symfony/symfony/pull/23684
https://github.com/barryvdh/laravel-debugbar/issues/850

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