CVE-2026-126932: File Upload RCE (CVSS 4.3)

Description

Zipline 4.6.2 before 4.8.0 contains a policy bypass vulnerability that allows authenticated users to evade administrator-disabled MIME types by editing file metadata. Attackers can upload a permitted file, then set a disabled type such as text/html through PATCH /api/user/files/:id so /raw/:id serves that Content-Type.

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CVSS v3.1 Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Weakness Type (CWE)

CWE-434 Unrestricted Upload

References

Other References

https://github.com/diced/zipline/blob/v4.7.0/src/server/routes/api/user/files/%5Bid%5D/index.ts#L96 https://github.com/diced/zipline/commit/fc8e886ca841b86a3f677cd7dac1bf9a5bd45b2c https://github.com/diced/zipline/releases/tag/v4.8.0 https://github.com/diced/zipline/security/advisories/GHSA-rgxm-54cf-whf7 https://www.vulncheck.com/advisories/zipline-4.6.2-before-4.8.0-disabled-mime-type-policy-bypass-via-file-metadata-update

Frequently Asked Questions

What is CVE-2026-126932? +

Zipline 4.6.2 before 4.8.0 contains a policy bypass vulnerability that allows authenticated users to evade administrator-disabled MIME types by editing file metadata. Attackers can upload a permitted file, then set a disabled type such as text/html through PATCH /api/user/files/:id so /raw/:id serves that Content-Type. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-126932? +

CVE-2026-126932 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2026-126932? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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