CVE-2017-18343: sensiolabs symfony Cross-site Scripting
Vulnerability summary
CVE-2017-18343 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in sensiolabs symfony. EPSS estimates a 6.11% chance of exploitation in the next 30 days, higher than 93.3% of scored vulnerabilities. 2 public exploits are recorded.
Timeline
- 20-07-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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 metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated6.1MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · DebianEcosystem advisory · calculated6.1MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS trend
Probability
6.11%
Chance of exploitation in the next 30 days
Percentile
93%
Versus all other CVEs
30-day change
0.00 pp
From 6.11% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
2 foundSymfony
Maturity: poc
Laravel Debugbar
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Debian1 product
- symfony< 3.4.0+dfsg-1
Sensiolabs1 product
- symfony< 2.7.33 | ≥ 2.8.0, < 2.8.26 | ≥ 3.0.0, < 3.2.13 | ≥ 3.3.0, < 3.3.6
Ubuntu1 product
- symfony< 3.4.6+dfsg-1ubuntu0.1
3 vendors · 3 products
References
7 links- github.com/symfony/debug/pull/7/commits/e48bda29143bd1a83001780b4a78e483822d985cX Refsource MISCPatchThird Party AdvisoryREPORT
