CVE-2026-35200

Parse Server has a file upload Content-Type override via extension mismatch

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.73 and 9.7.1-alpha.4, a file can be uploaded with a filename extension that passes the file extension allowlist (e.g., .txt) but with a Content-Type header that differs from the extension (e.g., text/html). The Content-Type is passed to the storage adapter without consistency validation. Storage adapters that store and serve the provided Content-Type (such as S3 or GCS) serve the file with the mismatched Content-Type. The default GridFS adapter is not affected because it derives Content-Type from the filename at serving time. This vulnerability is fixed in 8.6.73 and 9.7.1-alpha.4.

Scores

Weaknesses (CWE)

• CWE-436

Advisories

• GHSA-vr5f-2r24-w5hc — Parse Server: File upload Content-Type override via extension mismatch

European references

• ENISA EUVD · EUVD-2026-19473
• GCVE · GCVE-0-2026-35200

Affected configurations (NVD CPE)

• cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* < 8.6.73
• cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* ≥ 9.0.0 < 9.7.1
• cpe:2.3:a:parseplatform:parse-server:9.7.1:alpha1:*:*:*:node.js:*:*
• cpe:2.3:a:parseplatform:parse-server:9.7.1:alpha2:*:*:*:node.js:*:*
• cpe:2.3:a:parseplatform:parse-server:9.7.1:alpha3:*:*:*:node.js:*:*

Affected products

References

• https://github.com/parse-community/parse-server/security/advisories/GHSA-vr5f-2r24-w5hc
• https://github.com/parse-community/parse-server/pull/10383
• https://github.com/parse-community/parse-server/pull/10384

Sources