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Vulnerability details: VCID-skth-cf6d-3ubr
Vulnerability ID VCID-skth-cf6d-3ubr
Aliases CVE-2017-18343
Summary Cross-site Scripting The debug handler in Symfony has an XSS via an array key during exception pretty printing in `ExceptionHandler.php`, as demonstrated by a `/_debugbar/open?op`=get` URI.
Status Disputed
Exploitability 0.5
Weighted Severity 5.5
Risk 2.8
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00504 https://api.first.org/data/v1/epss?cve=CVE-2017-18343
epss 0.00504 https://api.first.org/data/v1/epss?cve=CVE-2017-18343
epss 0.00504 https://api.first.org/data/v1/epss?cve=CVE-2017-18343
epss 0.00504 https://api.first.org/data/v1/epss?cve=CVE-2017-18343
epss 0.00504 https://api.first.org/data/v1/epss?cve=CVE-2017-18343
epss 0.00504 https://api.first.org/data/v1/epss?cve=CVE-2017-18343
epss 0.00504 https://api.first.org/data/v1/epss?cve=CVE-2017-18343
epss 0.00504 https://api.first.org/data/v1/epss?cve=CVE-2017-18343
epss 0.00504 https://api.first.org/data/v1/epss?cve=CVE-2017-18343
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2017-18343
cvssv3 6.1 https://nvd.nist.gov/vuln/detail/CVE-2017-18343
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2017-18343
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18343
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
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
CVE-2017-18343 https://nvd.nist.gov/vuln/detail/CVE-2017-18343
No exploits are available.
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2017-18343
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2017-18343
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.66097
EPSS Score 0.00504
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-03T08:05:01.951754+00:00 NVD CVE Status Improver Improve https://cveawg.mitre.org/api/cve/CVE-2017-18343 38.1.0
2026-04-01T12:47:51.757766+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/symfony/symfony/CVE-2017-18343.yml 38.0.0