CVE-2020-4070: w3c css_validator Cross-site Scripting
CVSS: 5.4v3.1MediumModified
Published 22-06-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-4070 is a medium (CVSS 5.4) Cross-site Scripting vulnerability in w3c css_validator. EPSS estimates a 0.55% chance of exploitation in the next 30 days, higher than 45.1% of scored vulnerabilities.
CVSS score
5.4/10
010
Medium · v3.1 (NVD)EPSS score
0.55%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 22-06-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 2 sources · 2 versionsMedium 5.4Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:NSources2 sources · 4.6–5.4
- CVE.orgCNA4.6MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:NDiffers
Low 3.5Preferred score · NVD (NIST)
AV:N/AC:M/Au:S/C:N/I:P/A:NSourcesSingle source
EPSS trend
Probability
0.55%
Chance of exploitation in the next 30 days
Percentile
45%
Versus all other CVEs
30-day change
0.00 pp
From 0.55% on 21-09-2026
21-09-202621-10-2026
EPSS score0.55%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
W3c1 product
- css_validator≤ 2020-01-19
World wide web consortium (w3c)1 product
- css validator≤ 54d68a1
2 vendors · 2 products
References
2 links- github.com/w3c/css-validator/security/advisories/GHSA-wf36-7w73-rh8cX Refsource CONFIRMVendor Advisory