How severe is CVE-2021-24276?

CVE-2021-24276 has a CVSS 3.x base score of 6.1, rated medium 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 none.

Is CVE-2021-24276 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24276?

CVE-2021-24276 affects Supsystic Contact Form. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24276?

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

When was CVE-2021-24276 published?

CVE-2021-24276 was published on 2021-05-05 and last updated on 2026-06-17.

CVE-2021-24276

CVE-2021-24276 is a medium-severity vulnerability in Supsystic Contact Form with a CVSS 3.x base score of 6.1. Its EPSS exploit-prediction score of 16% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 16% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Supsystic Contact Form
Published: 2021-05-05
Last modified: 2026-06-17

Description

The Contact Form by Supsystic WordPress plugin before 1.7.15 did not sanitise the tab parameter of its options page before outputting it in an attribute, leading to a reflected Cross-Site Scripting issue

Frequently asked questions

What is CVE-2021-24276?: The Contact Form by Supsystic WordPress plugin before 1.7.15 did not sanitise the tab parameter of its options page before outputting it in an attribute, leading to a reflected Cross-Site Scripting issue
How severe is CVE-2021-24276?: CVE-2021-24276 has a CVSS 3.x base score of 6.1, rated medium 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 none.
Is CVE-2021-24276 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24276?: CVE-2021-24276 affects Supsystic Contact Form. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24276?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-24276 published?: CVE-2021-24276 was published on 2021-05-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:supsystic:contact_form:*:*:*:*:*:wordpress:*:*

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