MoonShine Arbitrary File Upload Vulnerability

published 2025-08-19 14 mo ago modified 2026-09-10 1 mo ago also GHSA-8xfq-7f6m-mpmf , EUVD-2025-25180

cvss: 4.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits: 0; none known

A Stored Cross-Site Scripting (XSS) vulnerability exists in MoonShine version < 3.12.5, allowing remote attackers to upload a malicious SVG file when creating/updating an Article and correctly execute arbitrary JavaScript when the file link is opened.

Patch / fix

fixed in 2 links 1

packagist moonshine/moonshine 3.12.5
moonshine moonshine 3.12.5

github.com/moonshine-software/moonshine@7102fb1 commit

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 14 mo ago (2025-08-19)

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/GiacoLenzo2109/MoonShine_Software_PoCs referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	4.5	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CNA	3.1	4.5	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N
GitHub	3.1	4.5	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	moonshine/moonshine	<3.12.5	3.12.5

Classification

Weakness

CWE-434 Unrestricted Upload of File with Dangerous Type
CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /moonshine-software/moonshine/commit/7102fb113627870fb1cb7176e1d0d95bb47a7fd4
web
github.com /GiacoLenzo2109/MoonShine_Software_PoCs
web, exploit, third-party-advisory
github.com /moonshine-software/moonshine
package, product
nvd.nist.gov /vuln/detail/CVE-2025-51489
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary