How severe is CVE-2021-24856?

CVE-2021-24856 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-2021-24856 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24856?

CVE-2021-24856 affects Tammersoft Shared Files. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24856?

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

When was CVE-2021-24856 published?

CVE-2021-24856 was published on 2021-11-17 and last updated on 2026-06-17.

CVE-2021-24856

CVE-2021-24856 is a medium-severity vulnerability in Tammersoft Shared Files 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)
CVSS v2: 3.5
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Tammersoft Shared Files
Published: 2021-11-17
Last modified: 2026-06-17

Description

The Shared Files WordPress plugin before 1.6.61 does not sanitise and escape the Download Counter Text settings, which could allow high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed

Frequently asked questions

What is CVE-2021-24856?: The Shared Files WordPress plugin before 1.6.61 does not sanitise and escape the Download Counter Text settings, which could allow high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed
How severe is CVE-2021-24856?: CVE-2021-24856 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-2021-24856 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24856?: CVE-2021-24856 affects Tammersoft Shared Files. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24856?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-24856 published?: CVE-2021-24856 was published on 2021-11-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:tammersoft:shared_files:*:*:*:*:*:wordpress:*:*

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