How severe is CVE-2021-42118?

CVE-2021-42118 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2021-42118 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42118?

CVE-2021-42118 affects Businessdnasolutions Topease. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42118?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-42118 published?

CVE-2021-42118 was published on 2021-11-30 and last updated on 2026-06-17.

CVE-2021-42118

CVE-2021-42118 is a high-severity vulnerability in Businessdnasolutions Topease with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 3.5
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Businessdnasolutions Topease
Published: 2021-11-30
Last modified: 2026-06-17

Description

Persistent Cross Site Scripting in Web Applications operating on Business-DNA Solutions GmbH’s TopEase® Platform Version <= 7.1.27 via the Structure Component allows an authenticated remote attacker with Object Modification privileges to inject arbitrary HTML and JavaScript code in an object attribute, which is then rendered in the Structure Component, to alter the intended functionality and steal cookies, the latter allowing for account takeover.

Frequently asked questions

What is CVE-2021-42118?: Persistent Cross Site Scripting in Web Applications operating on Business-DNA Solutions GmbH’s TopEase® Platform Version <= 7.1.27 via the Structure Component allows an authenticated remote attacker with Object Modification privileges to inject arbitrary HTML and JavaScript code in an object attribute, which is then rendered in the Structure Component, to alter the intended functionality and steal cookies, the latter allowing for account takeover.
How severe is CVE-2021-42118?: CVE-2021-42118 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2021-42118 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42118?: CVE-2021-42118 affects Businessdnasolutions Topease. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42118?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-42118 published?: CVE-2021-42118 was published on 2021-11-30 and last updated on 2026-06-17.

References

https://confluence.topease.ch/confluence/display/DOC/Release+Notes

Affected products (1)

cpe:2.3:a:businessdnasolutions:topease:*:*:*:*:*:*:*:*

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CVE-2021-42119 — High (CVSS 7.3): Persistent Cross Site Scripting in Web Applications operating on Business-DNA Solutions GmbH’s TopEase® Platform…
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CVE-2021-42122 — Medium (CVSS 4.3): Insufficient Input Validation in Web Applications operating on Business-DNA Solutions GmbH’s TopEase® Platform…

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