Parse Server Information Disclosure via Object Update Response (CVE-2026-120310)
Executive & SecOps Summary
SECOPS ASSESSMENTParse Server versions before 8.6.109 and 9.0.0 versions before 9.10.6-alpha.1
Attackers with update-only permissions (but no read access) can view sensitive object data, atomic operation results, and parent fields via update response payloads
Immediately upgrade Parse Server to version 8.6.109, 9.10.6-alpha.1, or higher
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Upgrade your Parse Server dependency to the patched versions using your package manager.
# For npm users
npm install parse-server@8.6.109 --save
# Or for 9.x users
npm install parse-server@9.10.6-alpha.1 --save
# For yarn users
yarn add parse-server@8.6.109
# Or for 9.x users
yarn add parse-server@9.10.6-alpha.12. Temporary Workaround & Hardening Configuration
If an immediate upgrade is not feasible, implement validation logic within Cloud Code beforeSave triggers to restrict update operations from unauthorized users or review CLPs/ACLs to minimize write permissions.
// Example Cloud Code Workaround (main.js)
// Intercept and validate update requests for sensitive classes
Parse.Cloud.beforeSave('SensitiveClass', async (request) => {
const { object, user, master } = request;
if (master) return;
// Implement custom logic to verify if the user should be allowed to trigger updates
if (!user) {
throw new Parse.Error(Parse.Error.OPERATION_FORBIDDEN, 'Access denied.');
}
});3. Log Audit & IoC Verification Commands
Verify the currently installed Parse Server version and inspect application logs for suspicious update patterns.
# Check the installed Parse Server version
npm list parse-server
# Audit logs for high-frequency PUT requests to class endpoints
grep -i 'PUT /parse/classes/' /var/log/parse-server.log | awk '{print $1, $7, $9}' | sort | uniq -cScan Your Repositories for Transitive Vulnerable Dependencies in 30 Seconds
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2026-120310) is an information disclosure flaw (CWE-200) in Parse Server, an open-source backend framework. Parse Server utilizes Class-Level Permissions (CLPs) and Access Control Lists (ACLs) to secure data. However, a design flaw exists in the object update API flow where the server returns stored field values in the update response without verifying if the requesting client has 'read' access to those fields.
2. Exploitation Mechanics & Attack Scenario
An attacker who possesses 'update' permissions but lacks 'read' permissions on a specific class or object can exploit this vulnerability:
- The attacker sends an update request (
PUT /parse/classes/<ClassName>/<ObjectId>) to the server. - The request can include atomic operations (such as Increment, Add, AddUnique, Remove) or trigger Cloud Code execution.
- Parse Server processes the update and returns the resulting stored field values in the response payload without checking read permissions.
- Under certain conditions, by using dot notation keys, the attacker can force the server to return the entire stored parent field, leading to unauthorized data exposure.
3. Infrastructure & Business Impact
Exploitation of this vulnerability compromises the confidentiality of data stored within the database. Sensitive business logic, audit logs, or personally identifiable information (PII) that was assumed to be protected by write-only permissions can be exposed. This can lead to compliance violations, loss of customer trust, and potential secondary attacks leveraging the exposed data.
Official Vendor Advisories & References
Parse Server before 8.6.109 and 9.0.0 before 9.10.6-alpha.1 returns stored field values in object update responses without checking read access, so clients whose class-level permissions or object ACLs allow update but not read can see object data. Attackers can update such objects to read atomic operation results (Increment, Add, AddUnique, Remove), Cloud Code trigger-set values, and, for dot notation keys under certain conditions, the whole stored parent field.
Frequently Asked SecOps Questions (CVE-2026-120310)
FAQQ1. How critical is CVE-2026-120310 and is it actively exploited in the wild?
CVE-2026-120310 is rated CVSS 3.1 (LOW) with a 30-day EPSS exploitation probability of 0.2%. Organizations running affected versions should prioritize patching based on network exposure.
Q2. Which vendors and products are affected by CVE-2026-120310?
Primary impacted vendors include parse-community across parse-server. Scope summary: Parse Server versions prior to 8.6.109, and versions 9.0.0 prior to 9.10.6-alpha.1
Q3. What temporary mitigations or workarounds exist for CVE-2026-120310 before patching?
[Mitigation] Immediately upgrade Parse Server to version 8.6.109, 9.10.6-alpha.1, or higher Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2026-120310
Instantly format this advisory into an executive CISO summary or engineering patch ticket.
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