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CVE-2026-45753

LOW
2.1
CVSS 4.0
Description
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, UrlAttributeSanitizer::getSupportedAttributes() omits URL-valued attributes including action, formaction, poster, and cite, so configurations that admit those attributes can leave javascript: URIs unsanitized and enable XSS when the resulting HTML is rendered or a victim submits a form or clicks a button. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.

Metadata

CVE ID
CVE-2026-45753
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-13 06:54 UTC
Published
2026-07-14 18:21 UTC
Last updated
2026-07-14 18:39 UTC
Primary CWE
CWE-79
CWE-79: Improper Neutralization of Input During Web Page Gen…
Vendor / Product
symfony / symfony
Sources
cve.org  ·  NVD

Severity & Metrics

2.1 LOW CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (2)
VendorProductPlatformVersions
symfony html-sanitizer — >= 6.1.0-BETA1, < 6.4.40, >= 7.0.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12
symfony symfony — >= 6.1.0-BETA1, < 6.4.40, >= 7.0.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12
Weakness (CWE)
CWESourceDescription
CWE-184 cna CWE-184: Incomplete List of Disallowed Inputs
CWE-79 cna CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS scores (1)
ScoreSeverityVersionSourceVector
2.1 LOW 4.0 cna CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
References (5)
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