CVE-2020-4070
Cross-site Scripting in CSS Validator
MEDIUM
5.4
CVSS Score
Published: June 22, 2020 at 03:40 PM UTC
Updated: June 17, 2026 at 03:19 AM UTC
2 products affected across 2 vendorsCSS ValidatorCSS Validator
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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.5%
Description
In CSS Validator less than or equal to commit 54d68a1, there is a cross-site scripting vulnerability in handling URIs. A user would have to click on a specifically crafted validator link to trigger it. This has been patched in commit e5c09a9.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v ≤ 2020-01-19
v ≤ 54d68a1
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (2)
x_refsource_MISCPatch
Source: [email protected]
https://github.com/w3c/css-validator/commit/e5c09a9119167d3064db786d5f00d730b584a53bx_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/w3c/css-validator/security/advisories/GHSA-wf36-7w73-rh8cCVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- REQUIRED
- Scope
- CHANGED
- Confidentiality
- LOW
- Integrity
- LOW
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-79
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