CVE-2026-126933 (CVSS 4.3)

Description

Zipline 4.0.0 before 4.8.0 contains an upload filter bypass vulnerability that allows users with upload access to store blocked file types due to extension format mismatch. The upload and partial handlers compare dotted, case-sensitive extensions against undotted disabledExtensions entries, letting authenticated or permitted unauthenticated folder uploaders bypass administrator restrictions.

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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-184 CWE-184

References

Other References

https://github.com/diced/zipline/blob/v4.7.0/src/server/routes/api/upload/index.ts#L170 https://github.com/diced/zipline/blob/v4.7.0/src/server/routes/api/upload/partial.ts#L294 https://github.com/diced/zipline/commit/dbc1fe502130a8ebd95fa04886efec01402e5b5f https://github.com/diced/zipline/releases/tag/v4.8.0 https://github.com/diced/zipline/security/advisories/GHSA-wwrw-gq56-7wpj https://www.vulncheck.com/advisories/zipline-4.0.0-before-4.8.0-disabled-extensions-upload-filter-bypass-via-extension-format-mismatch

Frequently Asked Questions

What is CVE-2026-126933? +

Zipline 4.0.0 before 4.8.0 contains an upload filter bypass vulnerability that allows users with upload access to store blocked file types due to extension format mismatch. The upload and partial handlers compare dotted, case-sensitive extensions against undotted disabledExtensions entries, letting authenticated or permitted unauthenticated folder uploaders bypass administrator restrictions. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-126933? +

CVE-2026-126933 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-2026-126933? +

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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