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Vulnerability details: VCID-twrs-rk3t-f3gf
Vulnerability ID VCID-twrs-rk3t-f3gf
Aliases CVE-2026-32728
GHSA-42ph-pf9q-cr72
Summary Parse Server has a stored XSS filter bypass via Content-Type MIME parameter and missing XML extension blocklist entries ### Impact An attacker who is allowed to upload files can bypass the file extension filter by appending a MIME parameter (e.g. `;charset=utf-8`) to the `Content-Type` header. This causes the extension validation to fail matching against the blocklist, allowing active content to be stored and served under the application's domain. In addition, certain XML-based file extensions that can render scripts in web browsers are not included in the default blocklist. This can lead to stored XSS attacks, compromising session tokens, user credentials, or other sensitive data accessible via the browser's local storage. ### Patches The fix strips MIME parameters from the `Content-Type` header before validating the file extension against the blocklist. The default blocklist has also been extended to include additional XML-based extensions (`xsd`, `rng`, `rdf`, `rdf+xml`, `owl`, `mathml`, `mathml+xml`) that can render active content in web browsers. Note that the `fileUpload.fileExtensions` option is intended to be configured as an allowlist of file extensions that are valid for a specific application, not as a denylist. The default denylist is provided only as a basic default that covers most common problematic extensions. It is not intended to be an exhaustive list of all potentially dangerous extensions. Developers should not rely on the default value, as new extensions that can render active content in browsers might emerge in the future. ### Workarounds Configure the `fileUpload.fileExtensions` option to use an allowlist of only the file extensions that your application needs, rather than relying on the default blocklist.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00014 https://api.first.org/data/v1/epss?cve=CVE-2026-32728
epss 0.00014 https://api.first.org/data/v1/epss?cve=CVE-2026-32728
epss 0.00014 https://api.first.org/data/v1/epss?cve=CVE-2026-32728
epss 0.00014 https://api.first.org/data/v1/epss?cve=CVE-2026-32728
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-42ph-pf9q-cr72
cvssv4 8.3 https://github.com/parse-community/parse-server
generic_textual HIGH https://github.com/parse-community/parse-server
cvssv4 8.3 https://github.com/parse-community/parse-server/commit/4f53ab3cad5502a51a509d53f999e00ff7217b8d
generic_textual HIGH https://github.com/parse-community/parse-server/commit/4f53ab3cad5502a51a509d53f999e00ff7217b8d
ssvc Track https://github.com/parse-community/parse-server/commit/4f53ab3cad5502a51a509d53f999e00ff7217b8d
cvssv4 8.3 https://github.com/parse-community/parse-server/commit/c7599c577a02b97eb5e76d4e20517b0283ae73c8
generic_textual HIGH https://github.com/parse-community/parse-server/commit/c7599c577a02b97eb5e76d4e20517b0283ae73c8
ssvc Track https://github.com/parse-community/parse-server/commit/c7599c577a02b97eb5e76d4e20517b0283ae73c8
cvssv4 8.3 https://github.com/parse-community/parse-server/pull/10191
generic_textual HIGH https://github.com/parse-community/parse-server/pull/10191
ssvc Track https://github.com/parse-community/parse-server/pull/10191
cvssv4 8.3 https://github.com/parse-community/parse-server/pull/10192
generic_textual HIGH https://github.com/parse-community/parse-server/pull/10192
ssvc Track https://github.com/parse-community/parse-server/pull/10192
cvssv3.1_qr HIGH https://github.com/parse-community/parse-server/security/advisories/GHSA-42ph-pf9q-cr72
cvssv4 8.3 https://github.com/parse-community/parse-server/security/advisories/GHSA-42ph-pf9q-cr72
generic_textual HIGH https://github.com/parse-community/parse-server/security/advisories/GHSA-42ph-pf9q-cr72
ssvc Track https://github.com/parse-community/parse-server/security/advisories/GHSA-42ph-pf9q-cr72
cvssv4 8.3 https://nvd.nist.gov/vuln/detail/CVE-2026-32728
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-32728
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-32728
https://github.com/parse-community/parse-server
https://github.com/parse-community/parse-server/commit/4f53ab3cad5502a51a509d53f999e00ff7217b8d
https://github.com/parse-community/parse-server/commit/c7599c577a02b97eb5e76d4e20517b0283ae73c8
https://github.com/parse-community/parse-server/pull/10191
https://github.com/parse-community/parse-server/pull/10192
https://github.com/parse-community/parse-server/security/advisories/GHSA-42ph-pf9q-cr72
https://nvd.nist.gov/vuln/detail/CVE-2026-32728
GHSA-42ph-pf9q-cr72 https://github.com/advisories/GHSA-42ph-pf9q-cr72
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N Found at https://github.com/parse-community/parse-server
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N Found at https://github.com/parse-community/parse-server/commit/4f53ab3cad5502a51a509d53f999e00ff7217b8d
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-19T15:03:38Z/ Found at https://github.com/parse-community/parse-server/commit/4f53ab3cad5502a51a509d53f999e00ff7217b8d
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N Found at https://github.com/parse-community/parse-server/commit/c7599c577a02b97eb5e76d4e20517b0283ae73c8
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-19T15:03:38Z/ Found at https://github.com/parse-community/parse-server/commit/c7599c577a02b97eb5e76d4e20517b0283ae73c8
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N Found at https://github.com/parse-community/parse-server/pull/10191
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-19T15:03:38Z/ Found at https://github.com/parse-community/parse-server/pull/10191
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N Found at https://github.com/parse-community/parse-server/pull/10192
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-19T15:03:38Z/ Found at https://github.com/parse-community/parse-server/pull/10192
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N Found at https://github.com/parse-community/parse-server/security/advisories/GHSA-42ph-pf9q-cr72
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-19T15:03:38Z/ Found at https://github.com/parse-community/parse-server/security/advisories/GHSA-42ph-pf9q-cr72
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-32728
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Exploit Prediction Scoring System (EPSS)
Percentile 0.02886
EPSS Score 0.00014
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T17:00:24.313575+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-42ph-pf9q-cr72/GHSA-42ph-pf9q-cr72.json 38.6.0