How severe is CVE-2021-24516?

CVE-2021-24516 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-24516 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24516?

CVE-2021-24516 affects Planso Planso Forms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24516?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-24516 published?

CVE-2021-24516 was published on 2021-10-18 and last updated on 2026-06-17.

CVE-2021-24516

CVE-2021-24516 is a medium-severity vulnerability in Planso Planso Forms with a CVSS 3.x base score of 4.8. 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: Medium (CVSS 3.x base score 4.8)
CVSS v2: 3.5
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Planso Planso Forms
Published: 2021-10-18
Last modified: 2026-06-17

Description

The PlanSo Forms WordPress plugin through 2.6.3 does not escape the title of its Form before outputting it in attributes, allowing high privilege users such as admin to set XSS payload in it, even when the unfiltered_html is disallowed, leading to an Authenticated Stored Cross-Site Scripting issue.

Frequently asked questions

What is CVE-2021-24516?: The PlanSo Forms WordPress plugin through 2.6.3 does not escape the title of its Form before outputting it in attributes, allowing high privilege users such as admin to set XSS payload in it, even when the unfiltered_html is disallowed, leading to an Authenticated Stored Cross-Site Scripting issue.
How severe is CVE-2021-24516?: CVE-2021-24516 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-24516 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24516?: CVE-2021-24516 affects Planso Planso Forms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24516?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-24516 published?: CVE-2021-24516 was published on 2021-10-18 and last updated on 2026-06-17.

References

https://wpscan.com/vulnerability/88d70e35-4c22-4bc7-b1a5-24068d55257c

Affected products (1)

cpe:2.3:a:planso:planso_forms:*:*:*:*:*:wordpress:*:*

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