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Vulnerability record · CVE-2017-18343 · published 20 July 2018

CVE-2017-18343: Sensiolabs symfony cross-site scripting vulnerability

Sensiolabs · Symfony

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

6.1 CVSS 3.0 Medium EPSS 6.1% · top 6.8% CWE-79 · Cross-site scripting
6.1CVSS 3.0 base score, v2 4.3
6.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

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

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/barryvdh/laravel-debugbar/issues/850 ExploitThird Party Advisory
https://github.com/symfony/debug/pull/7/commits/e48bda29143bd1a83001780b4a78e483822d985c PatchThird Party Advisory
https://github.com/symfony/symfony/issues/27987 ExploitThird Party Advisory
https://github.com/symfony/symfony/pull/23684 Third Party Advisory
https://github.com/barryvdh/laravel-debugbar/issues/850 ExploitThird Party Advisory
https://github.com/symfony/debug/pull/7/commits/e48bda29143bd1a83001780b4a78e483822d985c PatchThird Party Advisory
https://github.com/symfony/symfony/issues/27987 ExploitThird Party Advisory
https://github.com/symfony/symfony/pull/23684 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2017-18343), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.