CVE-2021-35440

Name: CVE-2021-35440
Creator: NVD / NIST
Published: 2021-07-06T15:15:07.757+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.00%

Last modified Jun 17, 2026

CVE-2021-35440 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Smashing 1.3.4 is vulnerable to Cross Site Scripting (XSS). A URL for a widget can be crafted and used to execute JavaScript on the victim's computer. EPSS estimates a 1.00% chance of exploitation in the next 30 days.

Description

Smashing 1.3.4 is vulnerable to Cross Site Scripting (XSS). A URL for a widget can be crafted and used to execute JavaScript on the victim's computer. The JavaScript code can then steal data available in the session/cookies depending on the user environment (e.g. if re-using internal URL's for deploying, or cookies that are very permissive) private information may be retrieved by the attacker.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

1.00%

58.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Smashing Project	Smashing	1.3.4

References

https://github.com/Smashing/smashing/blob/ad7325f159f89854ca4e7d94e7be9bee507b6d46/CHANGELOG.mdRelease Notes, Third Party Advisory
https://github.com/Smashing/smashing/pull/186Patch, Third Party Advisory
https://github.com/Smashing/smashing/pull/186#issuecomment-871727614Patch, Third Party Advisory
https://github.com/Smashing/smashing/blob/ad7325f159f89854ca4e7d94e7be9bee507b6d46/CHANGELOG.mdRelease Notes, Third Party Advisory
https://github.com/Smashing/smashing/pull/186Patch, Third Party Advisory
https://github.com/Smashing/smashing/pull/186#issuecomment-871727614Patch, Third Party Advisory

Timeline

Published: Jul 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-35440?

How severe is CVE-2021-35440?

CVE-2021-35440 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.00% probability of exploitation in the next 30 days.

How do I fix CVE-2021-35440?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-35440?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST