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Fencer Vulns
medium 5.4

CVE-2019-10909 json

Symfony Cross-site Scripting (XSS) vulnerability

published 2019-05-16 7 y ago modified 2026-06-17 4 mo ago also GHSA-g996-q5r8-w7g2 , EUVD-2019-0749

cvss
5.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

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 4.2.x before 4.2.7, validation messages are not escaped, which can lead to XSS when user input is included. This is related to symfony/framework-bundle.

Patch / fix

  • packagist symfony/symfony 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7
  • packagist symfony/framework-bundle 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7
  • packagist drupal/core 8.5.15, 8.6.15
  • packagist drupal/drupal 8.5.15, 8.6.15
  • sensiolabs symfony 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7
  • drupal drupal 8.5.15, 8.6.15
  • symfony Debian 14, Debian 13, Debian 12 3.4.22+dfsg-2

debian advisories DEBIAN-CVE-2019-10909

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-10909 updated

php-symfony: Multiple vulnerabilities fixed in symfony 2.8.7

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.03% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:N/I:P/A:N
GitHub 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
packagist symfony/symfony
>=2.7.0, <2.7.51
>=2.8.0, <2.8.50
>=3.0.0, <3.4.26
>=4.0.0, <4.1.12
>=4.2.0, <4.2.7
2.7.51
2.8.50
3.4.26
4.1.12
4.2.7
packagist symfony/framework-bundle
>=2.7.0, <2.7.51
>=2.8.0, <2.8.50
>=3.0.0, <3.4.26
>=4.0.0, <4.1.12
>=4.2.0, <4.2.7
2.7.51
2.8.50
3.4.26
4.1.12
4.2.7
packagist drupal/core
>=8.0.0, <8.5.15
>=8.6.0, <8.6.15
8.5.15
8.6.15
packagist drupal/drupal
>=8.0.0, <8.5.15
>=8.6.0, <8.6.15
8.5.15
8.6.15

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.