How severe is CVE-2021-31721?

CVE-2021-31721 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-2021-31721 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31721?

CVE-2021-31721 affects Chevereto. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-31721?

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

When was CVE-2021-31721 published?

CVE-2021-31721 was published on 2021-06-30 and last updated on 2026-07-05.

CVE-2021-31721

CVE-2021-31721 is a medium-severity vulnerability in Chevereto 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% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Chevereto
Published: 2021-06-30
Last modified: 2026-07-05

Description

Chevereto before 3.17.1 allows Cross Site Scripting (XSS) via an image title at the image upload stage.

Frequently asked questions

What is CVE-2021-31721?: Chevereto before 3.17.1 allows Cross Site Scripting (XSS) via an image title at the image upload stage.
How severe is CVE-2021-31721?: CVE-2021-31721 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-2021-31721 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31721?: CVE-2021-31721 affects Chevereto. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-31721?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-31721 published?: CVE-2021-31721 was published on 2021-06-30 and last updated on 2026-07-05.

References

Affected products (1)

cpe:2.3:a:chevereto:chevereto:*:*:*:*:*:*:*:*

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