Contao Vulnerable to Cross-Site Scripting (XSS) through SVG uploads
The advisory, in context
Impact
Users can upload SVG files with malicious code, which is then executed in the back end and/or front end.
Patches
Update to Contao 4.13.54, 5.3.30 or 5.5.6.
Workarounds
Remove svg,svgz from the allowed upload file types in the system settings and from contao.editable_files in the config.yaml.
References
https://contao.org/en/security-advisories/cross-site-scripting-through-svg-uploads
For more information
If you have any questions or comments about this advisory, open an issue in contao/contao.
Affected packages
Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.
From 4.0.0 before 4.13.54
Fixed in 4.13.54
291 explicitly affected versions
4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.1.0, 4.1.0-RC1, 4.1.0-beta1, 4.1.1, 4.1.2, 4.1.3, 4.10.0, 4.10.0-RC1, 4.10.0-RC2, 4.10.0-RC3, 4.10.0-RC4, 4.10.1, 4.10.2, 4.10.3, 4.10.4, 4.10.5, 4.10.6, 4.10.7, 4.11.0, 4.11.0-RC1, 4.11.0-RC2, 4.11.1, 4.11.2, 4.11.3, 4.11.4, 4.11.5, 4.11.6, 4.11.7, 4.11.8, 4.11.9, 4.12.0, 4.12.0-RC1, 4.12.0-RC2, 4.12.0-RC3, 4.12.1, 4.12.2, 4.12.3, 4.12.4, 4.12.5, 4.12.6, 4.12.7, 4.13.0, 4.13.0-RC1, 4.13.0-RC2, 4.13.0-RC3, 4.13.1, 4.13.10, 4.13.11, 4.13.12, 4.13.13, 4.13.14, 4.13.15, 4.13.16, 4.13.17, 4.13.18, 4.13.19, 4.13.2, 4.13.20, 4.13.21, 4.13.22, 4.13.23, 4.13.24, 4.13.25, 4.13.26, 4.13.27, 4.13.28, 4.13.29, 4.13.3, 4.13.30, 4.13.31, 4.13.32, 4.13.33, 4.13.34, 4.13.35, 4.13.36, 4.13.37, 4.13.38, 4.13.39, 4.13.4, 4.13.40, 4.13.41, 4.13.42, 4.13.43, 4.13.44, 4.13.45, 4.13.46, 4.13.47, 4.13.48, 4.13.49, 4.13.5, 4.13.50, 4.13.51, 4.13.52, 4.13.53, 4.13.6, 4.13.7, 4.13.8, 4.13.9, 4.2.0, 4.2.0-RC1, 4.2.0-beta1, 4.2.1, 4.2.2, 4.2.3, 4.2.4, 4.2.5, 4.3.0, 4.3.0-RC1, 4.3.1, 4.3.10, 4.3.11, 4.3.2, 4.3.3, 4.3.4, 4.3.5, 4.3.6, 4.3.7, 4.3.8, 4.3.9, 4.4.0, 4.4.0-RC1, 4.4.0-RC2, 4.4.0-beta1, 4.4.1, 4.4.10, 4.4.11, 4.4.12, 4.4.13, 4.4.14, 4.4.15, 4.4.16, 4.4.17, 4.4.18, 4.4.19, 4.4.2, 4.4.20, 4.4.21, 4.4.22, 4.4.23, 4.4.24, 4.4.25, 4.4.26, 4.4.27, 4.4.28, 4.4.29, 4.4.3, 4.4.30, 4.4.31, 4.4.32, 4.4.33, 4.4.34, 4.4.35, 4.4.36, 4.4.37, 4.4.38, 4.4.39, 4.4.4, 4.4.40, 4.4.41, 4.4.42, 4.4.43, 4.4.44, 4.4.45, 4.4.46, 4.4.47, 4.4.48, 4.4.49, 4.4.5, 4.4.50, 4.4.51, 4.4.52, 4.4.53, 4.4.54, 4.4.55, 4.4.56, 4.4.57, 4.4.6, 4.4.7, 4.4.8, 4.4.9, 4.5.0, 4.5.0-RC1, 4.5.0-RC2, 4.5.0-beta1, 4.5.0-beta2, 4.5.0-beta3, 4.5.1, 4.5.10, 4.5.11, 4.5.12, 4.5.13, 4.5.14, 4.5.2, 4.5.3, 4.5.4, 4.5.5, 4.5.6, 4.5.7, 4.5.8, 4.5.9, 4.6.0, 4.6.0-RC1, 4.6.0-RC2, 4.6.0-RC3, 4.6.1, 4.6.10, 4.6.11, 4.6.12, 4.6.13, 4.6.14, 4.6.2, 4.6.3, 4.6.4, 4.6.5, 4.6.6, 4.6.7, 4.6.8, 4.6.9, 4.7.0, 4.7.0-RC1, 4.7.0-RC2, 4.7.0-RC3, 4.7.0-RC4, 4.7.1, 4.7.2, 4.7.3, 4.7.4, 4.7.5, 4.7.6, 4.7.7, 4.8.0, 4.8.0-RC1, 4.8.0-RC2, 4.8.1, 4.8.2, 4.8.3, 4.8.4, 4.8.5, 4.8.6, 4.8.7, 4.8.8, 4.9.0, 4.9.0-RC1, 4.9.0-RC2, 4.9.1, 4.9.10, 4.9.11, 4.9.12, 4.9.13, 4.9.14, 4.9.15, 4.9.16, 4.9.17, 4.9.18, 4.9.19, 4.9.2, 4.9.20, 4.9.21, 4.9.22, 4.9.23, 4.9.24, 4.9.25, 4.9.26, 4.9.27, 4.9.28, 4.9.29, 4.9.3, 4.9.30, 4.9.31, 4.9.32, 4.9.33, 4.9.34, 4.9.35, 4.9.36, 4.9.37, 4.9.38, 4.9.39, 4.9.4, 4.9.40, 4.9.41, 4.9.42, 4.9.5, 4.9.6, 4.9.7, 4.9.8, 4.9.9
View affected-version evidence
{
"ranges": [
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"4.10.6",
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"4.11.0",
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"4.11.0-RC2",
"4.11.1",
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"4.13.10",
"4.13.11",
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"4.13.13",
"4.13.14",
"4.13.15",
"4.13.16",
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"4.13.18",
"4.13.19",
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"4.13.21",
"4.13.22",
"4.13.23",
"4.13.24",
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"4.13.26",
"4.13.27",
"4.13.28",
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"4.13.3",
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"4.13.32",
"4.13.33",
"4.13.34",
"4.13.35",
"4.13.36",
"4.13.37",
"4.13.38",
"4.13.39",
"4.13.4",
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"4.13.45",
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"4.13.47",
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"4.13.5",
"4.13.50",
"4.13.51",
"4.13.52",
"4.13.53",
"4.13.6",
"4.13.7",
"4.13.8",
"4.13.9",
"4.2.0",
"4.2.0-RC1",
"4.2.0-beta1",
"4.2.1",
"4.2.2",
"4.2.3",
"4.2.4",
"4.2.5",
"4.3.0",
"4.3.0-RC1",
"4.3.1",
"4.3.10",
"4.3.11",
"4.3.2",
"4.3.3",
"4.3.4",
"4.3.5",
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"4.3.7",
"4.3.8",
"4.3.9",
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"4.4.0-RC1",
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"4.4.0-beta1",
"4.4.1",
"4.4.10",
"4.4.11",
"4.4.12",
"4.4.13",
"4.4.14",
"4.4.15",
"4.4.16",
"4.4.17",
"4.4.18",
"4.4.19",
"4.4.2",
"4.4.20",
"4.4.21",
"4.4.22",
"4.4.23",
"4.4.24",
"4.4.25",
"4.4.26",
"4.4.27",
"4.4.28",
"4.4.29",
"4.4.3",
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"4.4.31",
"4.4.32",
"4.4.33",
"4.4.34",
"4.4.35",
"4.4.36",
"4.4.37",
"4.4.38",
"4.4.39",
"4.4.4",
"4.4.40",
"4.4.41",
"4.4.42",
"4.4.43",
"4.4.44",
"4.4.45",
"4.4.46",
"4.4.47",
"4.4.48",
"4.4.49",
"4.4.5",
"4.4.50",
"4.4.51",
"4.4.52",
"4.4.53",
"4.4.54",
"4.4.55",
"4.4.56",
"4.4.57",
"4.4.6",
"4.4.7",
"4.4.8",
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"4.5.0",
"4.5.0-RC1",
"4.5.0-RC2",
"4.5.0-beta1",
"4.5.0-beta2",
"4.5.0-beta3",
"4.5.1",
"4.5.10",
"4.5.11",
"4.5.12",
"4.5.13",
"4.5.14",
"4.5.2",
"4.5.3",
"4.5.4",
"4.5.5",
"4.5.6",
"4.5.7",
"4.5.8",
"4.5.9",
"4.6.0",
"4.6.0-RC1",
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"4.6.0-RC3",
"4.6.1",
"4.6.10",
"4.6.11",
"4.6.12",
"4.6.13",
"4.6.14",
"4.6.2",
"4.6.3",
"4.6.4",
"4.6.5",
"4.6.6",
"4.6.7",
"4.6.8",
"4.6.9",
"4.7.0",
"4.7.0-RC1",
"4.7.0-RC2",
"4.7.0-RC3",
"4.7.0-RC4",
"4.7.1",
"4.7.2",
"4.7.3",
"4.7.4",
"4.7.5",
"4.7.6",
"4.7.7",
"4.8.0",
"4.8.0-RC1",
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"4.8.1",
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"4.8.3",
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"4.9.6",
"4.9.7",
"4.9.8",
"4.9.9"
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}From 5.3.0 before 5.3.30
Fixed in 5.3.30
30 explicitly affected versions
5.3.0, 5.3.1, 5.3.10, 5.3.11, 5.3.12, 5.3.13, 5.3.14, 5.3.15, 5.3.16, 5.3.17, 5.3.18, 5.3.19, 5.3.2, 5.3.20, 5.3.21, 5.3.22, 5.3.23, 5.3.24, 5.3.25, 5.3.26, 5.3.27, 5.3.28, 5.3.29, 5.3.3, 5.3.4, 5.3.5, 5.3.6, 5.3.7, 5.3.8, 5.3.9
View affected-version evidence
{
"ranges": [
{
"events": [
{
"introduced": "5.3.0"
},
{
"fixed": "5.3.30"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.3.0",
"5.3.1",
"5.3.10",
"5.3.11",
"5.3.12",
"5.3.13",
"5.3.14",
"5.3.15",
"5.3.16",
"5.3.17",
"5.3.18",
"5.3.19",
"5.3.2",
"5.3.20",
"5.3.21",
"5.3.22",
"5.3.23",
"5.3.24",
"5.3.25",
"5.3.26",
"5.3.27",
"5.3.28",
"5.3.29",
"5.3.3",
"5.3.4",
"5.3.5",
"5.3.6",
"5.3.7",
"5.3.8",
"5.3.9"
]
}From 5.4.0 before 5.5.6
Fixed in 5.5.6
25 explicitly affected versions
5.4.0, 5.4.1, 5.4.10, 5.4.11, 5.4.12, 5.4.13, 5.4.14, 5.4.2, 5.4.3, 5.4.4, 5.4.5, 5.4.6, 5.4.7, 5.4.8, 5.4.9, 5.5.0, 5.5.0-RC1, 5.5.0-RC2, 5.5.0-RC3, 5.5.0-RC4, 5.5.1, 5.5.2, 5.5.3, 5.5.4, 5.5.5
View affected-version evidence
{
"ranges": [
{
"events": [
{
"introduced": "5.4.0"
},
{
"fixed": "5.5.6"
}
],
"type": "ECOSYSTEM"
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],
"versions": [
"5.4.0",
"5.4.1",
"5.4.10",
"5.4.11",
"5.4.12",
"5.4.13",
"5.4.14",
"5.4.2",
"5.4.3",
"5.4.4",
"5.4.5",
"5.4.6",
"5.4.7",
"5.4.8",
"5.4.9",
"5.5.0",
"5.5.0-RC1",
"5.5.0-RC2",
"5.5.0-RC3",
"5.5.0-RC4",
"5.5.1",
"5.5.2",
"5.5.3",
"5.5.4",
"5.5.5"
]
}