How severe is CVE-2019-16520?

CVE-2019-16520 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-16520 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-16520?

CVE-2019-16520 affects Semperplugins All In One Seo Pack. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-16520?

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

When was CVE-2019-16520 published?

CVE-2019-16520 was published on 2019-10-16 and last updated on 2026-06-17.

CVE-2019-16520

CVE-2019-16520 is a medium-severity vulnerability in Semperplugins All In One Seo Pack with a CVSS 3.x base score of 5.4. 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 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Semperplugins All In One Seo Pack
Published: 2019-10-16
Last modified: 2026-06-17

Description

The all-in-one-seo-pack plugin before 3.2.7 for WordPress (aka All in One SEO Pack) is susceptible to Stored XSS due to improper encoding of the SEO-specific description for posts provided by the plugin via unsafe placeholder replacement.

Frequently asked questions

What is CVE-2019-16520?: The all-in-one-seo-pack plugin before 3.2.7 for WordPress (aka All in One SEO Pack) is susceptible to Stored XSS due to improper encoding of the SEO-specific description for posts provided by the plugin via unsafe placeholder replacement.
How severe is CVE-2019-16520?: CVE-2019-16520 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-16520 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-16520?: CVE-2019-16520 affects Semperplugins All In One Seo Pack. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-16520?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-16520 published?: CVE-2019-16520 was published on 2019-10-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:semperplugins:all_in_one_seo_pack:*:*:*:*:*:wordpress:*:*

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