How severe is CVE-2021-36821?

CVE-2021-36821 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2021-36821 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36821?

CVE-2021-36821 affects Incsub Forminator. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-36821?

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-2021-36821 published?

CVE-2021-36821 was published on 2023-03-16 and last updated on 2026-06-17.

CVE-2021-36821

CVE-2021-36821 is a high-severity vulnerability in Incsub Forminator with a CVSS 3.x base score of 7.1. 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 7.1)
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Incsub Forminator
Published: 2023-03-16
Last modified: 2026-06-17

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WPMU DEV Forminator allows Stored XSS.This issue affects Forminator: from n/a through 1.14.11.

Frequently asked questions

What is CVE-2021-36821?: Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WPMU DEV Forminator allows Stored XSS.This issue affects Forminator: from n/a through 1.14.11.
How severe is CVE-2021-36821?: CVE-2021-36821 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2021-36821 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36821?: CVE-2021-36821 affects Incsub Forminator. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36821?: 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-2021-36821 published?: CVE-2021-36821 was published on 2023-03-16 and last updated on 2026-06-17.

References

https://patchstack.com/database/vulnerability/forminator/wordpress-forminator-plugin-1-14-11-stored-cross-site-scripting-xss-vulnerability?_s_id=cve

Affected products (1)

cpe:2.3:a:incsub:forminator:*:*:*:*:*:wordpress:*:*

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