High severity8.8NVD Advisory· Published Jul 7, 2021· Updated Jun 17, 2026

CVE-2021-28931

Description

Arbitrary file upload vulnerability in Fork CMS 5.9.2 allows attackers to create or replace arbitrary files in the /themes directory via a crafted zip file uploaded to the Themes panel.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
forkcms/forkcmsPackagist	< 5.9.3	5.9.3

Affected products

Fork CMS/Fork CMS
cpe:2.3:a:fork-cms:fork_cms:5.9.2:*:*:*:*:*:*:*
Fork/CMSdescription
ghsa-coords
pkg:composer/forkcms/forkcms
Range: < 5.9.3

Patches

Vulnerability mechanics

References

github.com/advisories/GHSA-748f-wv76-x9hgghsaADVISORY
github.com/bousalman/ForkCMS-arbitrary-upload/blob/main/README.mdnvdThird Party AdvisoryWEB
github.com/forkcms/forkcms/releases/tag/5.9.2nvdRelease NotesThird Party AdvisoryWEB
nvd.nist.gov/vuln/detail/CVE-2021-28931ghsaADVISORY
github.com/forkcms/forkcms/pull/3351ghsaWEB

News mentions

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cvss	0.572
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000