CVE-2021-47958

CVE-2021-47958 is a medium-severity vulnerability with a CVSS 3.x base score of 4.3. 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-918.

Key facts

Description

CouchCMS 2.2.1 contains a server-side request forgery vulnerability that allows authenticated attackers to make arbitrary HTTP requests by uploading malicious SVG files. Attackers can upload SVG files containing external entity references through the browse.php endpoint to access internal services and resources.

Frequently asked questions

What is CVE-2021-47958?
CouchCMS 2.2.1 contains a server-side request forgery vulnerability that allows authenticated attackers to make arbitrary HTTP requests by uploading malicious SVG files. Attackers can upload SVG files containing external entity references through the browse.php endpoint to access internal services and resources.
How severe is CVE-2021-47958?
CVE-2021-47958 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-47958 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2021-47958?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2021-47958 have an EU (EUVD) identifier?
Yes. CVE-2021-47958 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-34813.
When was CVE-2021-47958 published?
CVE-2021-47958 was published on 2026-05-15 and last updated on 2026-06-17.

References

Other CWE-918 (Server-Side Request Forgery (SSRF)) vulnerabilities

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