CVE-2026-61448
Parse Server 9.0.0 Stored XSS via malformed Content-Type
Description
Parse Server is affected by a stored cross-site scripting (XSS) vulnerability in versions >= 9.0.0, < 9.10.0-alpha.2 and <= 8.6.83. When an uploaded file's extension is not recognized by the mime package, Parse Server preserves the client-supplied Content-Type. A malformed Content-Type that is not a valid type/subtype media type (e.g., 'image', 'image/', or 'image//svg+xml') bypasses the fileUpload.fileExtensions blocklist and is stored unchanged. On storage adapters that persist and serve the uploaded Content-Type (such as Amazon S3, Google Cloud Storage, or Azure Blob Storage), a browser cannot parse the malformed value and falls back to MIME-sniffing; a file whose body begins with HTML is rendered as HTML, executing embedded script in the application's origin against other users who open the file URL. The default GridFS storage adapter is not affected. Fixed in 9.10.0-alpha.2 and 8.6.84.
INFO
Published Date :
July 11, 2026, 2:16 p.m.
Last Modified :
Oct. 24, 2026, 1:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-61448
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | LOW | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | LOW | [email protected] |
Solution
- Update Parse Server to version 9.10.0-alpha.2 or later.
- Update Parse Server to version 8.6.84 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-61448.
| URL | Resource |
|---|---|
| https://github.com/parse-community/parse-server/security/advisories/GHSA-r899-h629-j84r | |
| https://www.vulncheck.com/advisories/parse-server-stored-xss-via-malformed-content-type |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-61448 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-61448
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-61448 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-61448 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 24, 2026
Action Type Old Value New Value Added Translation Title: parse-server de parse-community, Description: Parse Server se ve afectado por una vulnerabilidad de cross-site scripting (XSS) almacenado en las versiones >= 9.0.0, anterior a 9.10.0-alpha.2 y menor o igual que 8.6.83. Cuando la extensión de un archivo subido no es reconocida por el paquete mime, Parse Server conserva el Content-Type proporcionado por el cliente. Un Content-Type malformado que no es un tipo de medio tipo/subtipo válido (p. ej., 'image', 'image/', o 'image//svg+xml') elude la lista de bloqueo fileUpload.fileExtensions y se almacena sin cambios. En los adaptadores de almacenamiento que persisten y sirven el Content-Type subido (como Amazon S3, Google Cloud Storage o Azure Blob Storage), un navegador no puede analizar el valor malformado y recurre al MIME-sniffing; un archivo cuyo cuerpo comienza con HTML se renderiza como HTML, ejecutando scripts incrustados en el origen de la aplicación contra otros usuarios que abren la URL del archivo. El adaptador de almacenamiento GridFS predeterminado no se ve afectado. Corregido en 9.10.0-alpha.2 y 8.6.84. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 13, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-61448', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-13T16:09:47.693724Z'} -
New CVE Received by [email protected]
Jul. 11, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'parse-community', 'product': 'parse-server', 'versions': [{'status': 'affected', 'version': '9.0.0', 'lessThan': '9.10.0-alpha.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '9.10.0-alpha.2', 'versionType': 'semver'}], 'packageURL': 'pkg:npm/parse-server', 'defaultStatus': 'unaffected'}, {'vendor': 'parse-community', 'product': 'parse-server', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '8.6.84', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '8.6.84', 'versionType': 'semver'}], 'packageURL': 'pkg:npm/parse-server', 'defaultStatus': 'unaffected'}] Added Description Parse Server is affected by a stored cross-site scripting (XSS) vulnerability in versions >= 9.0.0, < 9.10.0-alpha.2 and <= 8.6.83. When an uploaded file's extension is not recognized by the mime package, Parse Server preserves the client-supplied Content-Type. A malformed Content-Type that is not a valid type/subtype media type (e.g., 'image', 'image/', or 'image//svg+xml') bypasses the fileUpload.fileExtensions blocklist and is stored unchanged. On storage adapters that persist and serve the uploaded Content-Type (such as Amazon S3, Google Cloud Storage, or Azure Blob Storage), a browser cannot parse the malformed value and falls back to MIME-sniffing; a file whose body begins with HTML is rendered as HTML, executing embedded script in the application's origin against other users who open the file URL. The default GridFS storage adapter is not affected. Fixed in 9.10.0-alpha.2 and 8.6.84. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-434 Added Reference https://github.com/parse-community/parse-server/security/advisories/GHSA-r899-h629-j84r Added Reference https://www.vulncheck.com/advisories/parse-server-stored-xss-via-malformed-content-type