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CVE-2019-10909

20
FAUCET Score

CVE-2019-10909 is a cross-site scripting (XSS) vulnerability affecting multiple versions of Symfony, including those integrated with Drupal. This flaw allows unescaped user input within validation messages to execute malicious scripts in a victim's browser. With a CVSS score of 5.4 (Medium), it requires user interaction and low privileges, potentially leading to limited impact on confidentiality and integrity. While not listed in CISA's KEV catalog and lacking public exploit code, the vulnerability has garnered some community discussion and media coverage, indicating awareness within the cybersecurity landscape.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.7.0, < 2.7.51CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 2.8.0, < 2.8.50CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 3.4.0, < 3.4.26CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 4.1.0, < 4.1.12CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 4.2.0, < 4.2.7CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.05%
Probability of exploitation in next 30 days
EPSS Percentile
60.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0105 is in the 93rd percentile among its peer group of 15,239 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (15)

composerpatch availablevia ghsa
Product: symfony/framework-bundleFixed in: 2.7.51
composerpatch availablevia ghsa
Product: symfony/framework-bundleFixed in: 2.8.50
composerpatch availablevia ghsa
Product: symfony/framework-bundleFixed in: 3.4.26
composerpatch availablevia ghsa
Product: symfony/framework-bundleFixed in: 4.1.12
composerpatch availablevia ghsa
Product: symfony/framework-bundleFixed in: 4.2.7
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 2.7.51
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 2.8.50
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 3.4.26
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 4.1.12
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 4.2.7
composerpatch availablevia ghsa
Product: drupal/coreFixed in: 8.6.15
composerpatch availablevia ghsa
Product: drupal/coreFixed in: 8.5.15
composerpatch availablevia ghsa
Product: drupal/drupalFixed in: 8.5.15
composerpatch availablevia ghsa
Product: drupal/drupalFixed in: 8.6.15
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-g996-q5r8-w7g2medium

Symfony Cross-site Scripting (XSS) vulnerability

Nov 12, 2019

References

github.com / symfony/symfony/commit/ab4d05358c3d0dd1a36fc8c306829f68e3dd84e2
PatchThird Party Advisory
symfony.com / blog/cve-2019-10909-escape-validation-messages-in-the-php-templating-engine
Vendor Advisory
drupal.org / sa-core-2019-005
Third Party Advisory
synology.com / security/advisory/Synology_SA_19_19
Third Party Advisory