parse-community parse-server up to 8.6.66/9.7.0-alpha.10 Cloud Function authorization

Summaryinfo

A vulnerability identified as critical has been detected in parse-community parse-server up to 8.6.66/9.7.0-alpha.10. Affected is an unknown function of the component Cloud Function Handler. The manipulation leads to authorization. This vulnerability is traded as CVE-2026-34532. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in parse-community parse-server up to 8.6.66/9.7.0-alpha.10. It has been rated as critical. This issue affects some unknown functionality of the component Cloud Function Handler. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.67 and 9.7.0-alpha.11, an attacker can bypass Cloud Function validator access controls by appending "prototype.constructor" to the function name in the URL. When a Cloud Function handler is declared using the function keyword and its validator is a plain object or arrow function, the trigger store traversal resolves the handler through its own prototype chain while the validator store fails to mirror this traversal, causing all access control enforcement to be skipped. This allows unauthenticated callers to invoke Cloud Functions that are meant to be protected by validators such as requireUser, requireMaster, or custom validation logic. This issue has been patched in versions 8.6.67 and 9.7.0-alpha.11.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-34532 since 03/30/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 8.6.67 or 9.7.0-alpha.11 eliminates this vulnerability. Applying the patch 4fc48cf28f22eea200d74d883505f485234a48d7 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-17473). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• parse-community

Name

• parse-server

Version

• 8.6.0
• 8.6.1
• 8.6.2
• 8.6.3
• 8.6.4
• 8.6.5
• 8.6.6
• 8.6.7
• 8.6.8
• 8.6.9
• 8.6.10
• 8.6.11
• 8.6.12
• 8.6.13
• 8.6.14
• 8.6.15
• 8.6.16
• 8.6.17
• 8.6.18
• 8.6.19
• 8.6.20
• 8.6.21
• 8.6.22
• 8.6.23
• 8.6.24
• 8.6.25
• 8.6.26
• 8.6.27
• 8.6.28
• 8.6.29
• 8.6.30
• 8.6.31
• 8.6.32
• 8.6.33
• 8.6.34
• 8.6.35
• 8.6.36
• 8.6.37
• 8.6.38
• 8.6.39
• 8.6.40
• 8.6.41
• 8.6.42
• 8.6.43
• 8.6.44
• 8.6.45
• 8.6.46
• 8.6.47
• 8.6.48
• 8.6.49
• 8.6.50
• 8.6.51
• 8.6.52
• 8.6.53
• 8.6.54
• 8.6.55
• 8.6.56
• 8.6.57
• 8.6.58
• 8.6.59
• 8.6.60
• 8.6.61
• 8.6.62
• 8.6.63
• 8.6.64
• 8.6.65
• 8.6.66
• 9.7.0-alpha.0
• 9.7.0-alpha.1
• 9.7.0-alpha.2
• 9.7.0-alpha.3
• 9.7.0-alpha.4
• 9.7.0-alpha.5
• 9.7.0-alpha.6
• 9.7.0-alpha.7
• 9.7.0-alpha.8
• 9.7.0-alpha.9
• 9.7.0-alpha.10

License

• open-source

Website

• Product: https://github.com/parse-community/parse-server/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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