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CVE-2026-34595 parse-community CVE debrief

CVE-2026-34595 is a medium-severity vulnerability in Parse Server, an open-source backend that can be deployed to any infrastructure running Node.js. An authenticated user with find class-level permission can bypass the protectedFields class-level permission setting on LiveQuery subscriptions. This is achieved by sending a subscription with a $or, $and, or $nor operator value as a plain object with numeric keys and a length property, instead of an array, effectively bypassing the protected-field guard. The vulnerability allows an attacker to infer whether a protected field matches a given test value, potentially leading to unauthorized access to sensitive information.

Vendor
parse-community
Product
parse-server
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-03-31
Original CVE updated
2026-07-24
Advisory published
2026-03-31
Advisory updated
2026-07-24

Who should care

Users of Parse Server, especially those with authenticated users with find class-level permission, should be aware of this vulnerability. Developers and administrators of applications using Parse Server should assess their exposure and take necessary actions to mitigate the risk. This includes updating to the latest version, restricting permissions, and monitoring for suspicious activity.

Technical summary

The vulnerability exists in Parse Server versions prior to 8.6.70 and 9.7.0-alpha.18. An authenticated user can exploit this by crafting a subscription with a specific structure, allowing them to infer whether a protected field matches a given test value. This can lead to unauthorized access to sensitive information. The issue arises from the handling of $or, $and, or $nor operator values as plain objects with numeric keys and a length property, effectively bypassing the protected-field guard.

Defensive priority

Medium

Recommended defensive actions

  • Update Parse Server to version 8.6.70 or 9.7.0-alpha.18, or later
  • Restrict find class-level permission to only necessary users
  • Monitor LiveQuery subscriptions for suspicious activity
  • Implement additional security measures, such as input validation and sanitization
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-03-31T16:16:34.087Z and last modified on 2026-07-24T20:10:00.147Z. The NVD entry is currently Analyzed. Evidence is limited to CVE and NVD information. Defenders should verify the accuracy of this information with additional sources and assess their exposure. The vulnerability affects Parse Server versions prior to 8.6.70 and 9.7.0-alpha.18.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-03-31T16:16:34.087Z and has not been modified since then. The NVD entry is currently Analyzed.