CVE-2026-9053: 9front 9front

Unrestricted file upload in 9front

CVSS 6.9 MediumEPSS 0.0028 · 20th percentile

Published by the CVE Program (CNA: 9front) at 22 May 2026, 02:57 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
9front	9front Package name: mothra	affected f04e113279274526a8dae34de373027b68921fbf to before d145acc9ef0da47131af6ad94e87264e04870d47 git Other versions: unaffected

Identifiers

CVE-2026-9053

CNA

9front

Weakness (CWE)

CWE-434

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.9	Medium	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:P/AU:N/R:A/RE:L/U:Amber	CNA (9front)

CISA KEV Not listed.
EPSS 0.0028, the 20th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 22 May 2026. New records show when each source confirmed them.

Sources

References from the CNA

git.9front.org/plan9front/9front/d145acc9ef0da47131af6ad94e87264e04870d47/commit.html mitigation

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.