How severe is CVE-2021-3137?

CVE-2021-3137 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-2021-3137 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3137?

CVE-2021-3137 affects Xwiki. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3137?

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

When was CVE-2021-3137 published?

CVE-2021-3137 was published on 2021-01-20 and last updated on 2026-06-17.

CVE-2021-3137

CVE-2021-3137 is a medium-severity vulnerability in Xwiki 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: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Xwiki
Published: 2021-01-20
Last modified: 2026-06-17

Description

XWiki 12.10.2 allows XSS via an SVG document to the upload feature of the comment section.

Frequently asked questions

What is CVE-2021-3137?: XWiki 12.10.2 allows XSS via an SVG document to the upload feature of the comment section.
How severe is CVE-2021-3137?: CVE-2021-3137 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-2021-3137 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3137?: CVE-2021-3137 affects Xwiki. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3137?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-3137 published?: CVE-2021-3137 was published on 2021-01-20 and last updated on 2026-06-17.

References

https://www.exploit-db.com/exploits/49437

Affected products (1)

cpe:2.3:a:xwiki:xwiki:12.10.2:*:*:*:*:*:*:*

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