How severe is CVE-2021-24837?

CVE-2021-24837 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-2021-24837 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24837?

CVE-2021-24837 affects Passster Project Passter. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24837?

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

When was CVE-2021-24837 published?

CVE-2021-24837 was published on 2023-01-23 and last updated on 2026-06-17.

CVE-2021-24837

CVE-2021-24837 is a medium-severity vulnerability in Passster Project Passter 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.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Passster Project Passter
Published: 2023-01-23
Last modified: 2026-06-17

Description

The Passster WordPress plugin before 3.5.5.8 does not escape the area parameter of its shortcode, which could allow users with a role as low as Contributor to perform Cross-Site Scripting attacks.

Frequently asked questions

What is CVE-2021-24837?: The Passster WordPress plugin before 3.5.5.8 does not escape the area parameter of its shortcode, which could allow users with a role as low as Contributor to perform Cross-Site Scripting attacks.
How severe is CVE-2021-24837?: CVE-2021-24837 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-2021-24837 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24837?: CVE-2021-24837 affects Passster Project Passter. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24837?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-24837 published?: CVE-2021-24837 was published on 2023-01-23 and last updated on 2026-06-17.

References

https://wpscan.com/vulnerability/5fea3ac3-d599-41f3-8f76-08f0d3552af1

Affected products (1)

cpe:2.3:a:passster_project:passter:*:*:*:*:*:wordpress:*:*

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CVE-2021-24881 — High (CVSS 7.5): The Passster WordPress plugin before 3.5.5.9 does not properly check for password, as well as that the post to be…

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