TI-2021-09868 Aliases CVE-2021-28931 GHSA-748f-wv76-x9hg

Arbitrary file upload vulnerability in Fork CMS 5.9.2 allows attackers to create or…

MEDIUM 40CWE-434Published 2021-07-07 · Updated 2024-08-03

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-434.

Summary

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.

Why it matters now

EPSS 0.0121 68th percentileScored 2026-11-07

Fix Fixed forkcms/forkcms (Packagist): 5.9.3

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA
—	forkcms/forkcms (Packagist)	before 5.9.3	5.9.3	Patch available	GHSA-748f-wv76-x9hg

— Vendor— Affected all versions Fixed in — No fix listed CNA
forkcms/forkcms (Packagist) Vendor— Affected before 5.9.3 Fixed in 5.9.3 Patch available GHSA-748f-wv76-x9hg

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:fork-cms:fork_cms:5.9.2:::::::*	5.9.2	Vulnerable	forkcms

cpe:2.3:a:fork-cms:fork_cms:5.9.2:*:*:*:*:*:*:* Versions 5.9.2 Vulnerable ·forkcms

Remediation

Fix · GHSA-748f-wv76-x9hg forkcms/forkcms (Packagist) Fixed in 5.9.3 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2021-28931
2026-10-03 Alias added: GHSA-748f-wv76-x9hg

References

Advisory 3

Other 1

https://github.com/forkcms/forkcms/pull/3351

TI-2019-11621 Spoon Library through 2014-02-06, as used in Fork CMS before 1.4.1 and other products… CVSS 3.0CRITICAL 9.8
TI-2020-14780 PHP object injection in the Ajax endpoint of the backend in ForkCMS below version 5.8.3… CVSS 3.1HIGH 8.8
TI-2022-00960 SQL injection through marking blog comments on bulk as spam in forkcms/forkcms CVSS 3.1HIGH 8.8
TI-2020-14742 Multiple cross-site request forgery (CSRF) vulnerabilities in the Admin Console in Fork… CVSS 3.1HIGH 8.8
TI-2020-14508 Cross-site request forgery (CSRF) in Fork-CMS before 5.8.2 allow remote attackers to… CVSS 3.1HIGH 8.8
TI-2015-01330 Multiple SQL injection vulnerabilities in Translations in Fork CMS before 3.8.6 allow… CVSS 2.0HIGH 7.5

See all 24 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences