TI-2017-13518 Aliases CVE-2017-18343 GHSA-mm4c-ww47-3x4c

The debug handler in Symfony before v2.7.33, 2.8.x before v2.8.26, 3.x before v3.2.13…

LOW 36CWE-79Published 2018-07-20 · Updated 2024-08-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

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

Why it matters now

EPSS 0.06107 93rd percentileScored 2026-11-07

Public exploit Yes 2 exploit referencesTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:sensiolabs:symfony::::::::	before 2.7.33; 2.8.0 to before 2.8.26; 3.0.0 to before 3.2.13; 3.3.0 to before 3.3.6	Vulnerable	sensiolabs

cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* Versions before 2.7.33; 2.8.0 to before 2.8.26; 3.0.0 to before 3.2.13; 3.3.0 to before 3.3.6 Vulnerable ·sensiolabs

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2017-18343
2026-10-03 Alias added: GHSA-mm4c-ww47-3x4c

References

Exploit 2

Patch 1

https://github.com/symfony/debug/pull/7/commits/e48bda29143bd1a83001780b4a78e483822d985c

Advisory 1

https://github.com/symfony/symfony/pull/23684

TI-2019-13616 An issue was discovered in Symfony 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0… CVSS 3.1CRITICAL 9.8
TI-2018-10604 An issue was discovered in Http Foundation in Symfony 2.7.0 through 2.7.48, 2.8.0 through… CVSS 3.1MEDIUM 6.5
TI-2019-08131 In Symfony before 2.7.51, 2.8.x before 2.8.50, 3.x before 3.4.26, 4.x before 4.1.12, and… CVSS 3.1CRITICAL 9.8
TI-2016-02159 Symfony before 2.8.6 and 3.x before 3.0.6 allows remote attackers to bypass… CVSS 3.0CRITICAL 9.8
TI-2019-08459 An issue was discovered in Symfony before 4.2.12 and 4.3.x before 4.3.8. CVSS 3.1CRITICAL 9.8
TI-2018-08136 An issue was discovered in the Ldap component in Symfony 2.8.x before 2.8.37, 3.3.x… CVSS 3.0CRITICAL 9.8

See all 88 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences