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CVE-2021-35440

21
FAUCET Score

CVE-2021-35440 describes a Cross-Site Scripting (XSS) vulnerability in Smashing 1.3.4. An attacker can craft a malicious URL for a widget to execute arbitrary JavaScript on a victim's computer, potentially leading to the theft of session data or private information. This medium-severity vulnerability (CVSS 6.1) requires user interaction and has a network attack vector with low attack complexity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.3.4CPE matchmatch criteria
cpe:2.3:a:smashing_project:smashing:1.3.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.00%
Probability of exploitation in next 30 days
EPSS Percentile
59.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0100 is in the 71st percentile among its peer group of 26,221 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 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
rubygemspatch availablevia ghsa
Product: smashingFixed in: 1.3.5

Vendor Advisories (1)

rubygemsGHSA-254j-mmc5-qhpxmedium

Smashing Cross-site Scripting vulnerability

May 24, 2022

References

github.com / Smashing/smashing/blob/ad7325f159f89854ca4e7d94e7be9bee507b6d46/CHANGELOG.md
Release NotesThird Party Advisory
github.com / Smashing/smashing/pull/186
PatchThird Party Advisory
github.com / Smashing/smashing/pull/186
PatchThird Party Advisory