How severe is CVE-2021-36839?

CVE-2021-36839 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-2021-36839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36839?

CVE-2021-36839 affects Spacexchimp Social Media Follow Buttons Bar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-36839?

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

When was CVE-2021-36839 published?

CVE-2021-36839 was published on 2022-09-30 and last updated on 2026-06-17.

CVE-2021-36839

CVE-2021-36839 is a medium-severity vulnerability in Spacexchimp Social Media Follow Buttons Bar 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)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Spacexchimp Social Media Follow Buttons Bar
Published: 2022-09-30
Last modified: 2026-06-17

Description

Authenticated (admin+) Stored Cross-Site Scripting (XSS) vulnerability in Social Media Follow Buttons Bar plugin <= 4.73 at WordPress.

Frequently asked questions

What is CVE-2021-36839?: Authenticated (admin+) Stored Cross-Site Scripting (XSS) vulnerability in Social Media Follow Buttons Bar plugin <= 4.73 at WordPress.
How severe is CVE-2021-36839?: CVE-2021-36839 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-2021-36839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36839?: CVE-2021-36839 affects Spacexchimp Social Media Follow Buttons Bar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36839?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-36839 published?: CVE-2021-36839 was published on 2022-09-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:spacexchimp:social_media_follow_buttons_bar:*:*:*:*:*:wordpress:*:*

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