How severe is CVE-2021-38356?

CVE-2021-38356 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-2021-38356 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38356?

CVE-2021-38356 affects Nextscripts Social Networks Auto Poster. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-38356?

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

When was CVE-2021-38356 published?

CVE-2021-38356 was published on 2021-11-01 and last updated on 2026-06-17.

CVE-2021-38356

CVE-2021-38356 is a medium-severity vulnerability in Nextscripts Social Networks Auto Poster with a CVSS 3.x base score of 6.1. 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: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Nextscripts Social Networks Auto Poster
Published: 2021-11-01
Last modified: 2026-06-17

Description

The NextScripts: Social Networks Auto-Poster <= 4.3.20 WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the $_REQUEST['page'] parameter which is echoed out on inc/nxs_class_snap.php by supplying the appropriate value 'nxssnap-post' to load the page in $_GET['page'] along with malicious JavaScript in $_POST['page'].

Frequently asked questions

What is CVE-2021-38356?: The NextScripts: Social Networks Auto-Poster <= 4.3.20 WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the $_REQUEST['page'] parameter which is echoed out on inc/nxs_class_snap.php by supplying the appropriate value 'nxssnap-post' to load the page in $_GET['page'] along with malicious JavaScript in $_POST['page'].
How severe is CVE-2021-38356?: CVE-2021-38356 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-2021-38356 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38356?: CVE-2021-38356 affects Nextscripts Social Networks Auto Poster. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-38356?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-38356 published?: CVE-2021-38356 was published on 2021-11-01 and last updated on 2026-06-17.

References

https://www.wordfence.com/blog/2021/10/xss-vulnerability-in-nextscripts-social-networks-auto-poster-plugin-impacts-100000-sites/

Affected products (1)

cpe:2.3:a:nextscripts:social_networks_auto_poster:*:*:*:*:*:wordpress:*:*

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