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CVE-2023-52081

18
FAUCET Score

CVE-2023-52081 affects ffcss, a CLI tool for Firefox CSS themes, specifically versions prior to 0.2.0. The vulnerability allows for a bypass of input validation in the lookupPreprocess() function due to late Unicode normalization, reintroducing characters like dashes, underscores, and dots. Rated as MEDIUM severity (CVSS 5.3), it has a low potential impact, primarily affecting theme search functionality rather than system integrity (C:N/I:L/A:N). There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion, indicating a low current threat landscape.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.2.0CPE matchmatch criteria
cpe:2.3:a:ewen-lbh:firefox_css:*:*:*:*:*:go:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.52%
Probability of exploitation in next 30 days
EPSS Percentile
41.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0052 is in the 26th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/ewen-lbh/ffcssFixed in: 0.2.0

Vendor Advisories (1)

goGHSA-wpmx-564x-h2mhmedium

ewen-lbh/ffcss Late-Unicode normalization vulnerability

Dec 28, 2023

References

github.com / ewen-lbh/ffcss/commit/f9c491874b858a32fcae15045f169fd7d02f90dc
Patch
github.com / ewen-lbh/ffcss/security/advisories/GHSA-wpmx-564x-h2mh
ExploitVendor Advisory