parse-server: LiveQuery discloses object data to a subscriber across an ACL read-access change

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

2.3 · CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2026-57481: 0.53% estimated exploitation activity in the next 30 days; percentile 44.70 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact A Parse Server LiveQuery subscriber can receive object field values they are not authorized to read when a single save changes both an object field and the subscriber's ACL read access to that object. When such a save removes the subscriber's read access, the resulting leave event still carries the post-update object body, disclosing the new field values the subscriber is no longer permitted to read. The symmetric case applies to the enter event: when a save grants read access, the event includes the pre-grant object state the subscriber was not previously permitted to read. The disclosure is bounded to the single object affected by that save and is delivered only to the subscriber whose access changed. Applications that combine content changes with access-control changes in the same save on LiveQuery-enabled classes are affected. Patches Parse Server now verifies the subscriber's authorization for the specific object state included in leave and enter events. For a leave…

Published by the source

19 Jun 2026, 21:42 UTC

Last modified by the source

14 Jul 2026, 16:40 UTC

Source last checked

26 Oct 2026, 12:56 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-97pr-9hgg-3p8r

2. Revision 2 · amended · 24 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-97pr-9hgg-3p8r

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# Patch Next advisory brief: CVE-2026-57481

Advisory: parse-server: LiveQuery discloses object data to a subscriber across an ACL read-access change
IDs: CVE-2026-57481, GHSA-97pr-9hgg-3p8r
Record: https://patchnext.com/advisories/cve-2026-57481 (revision 3, source checked 26 Oct 2026, 12:56 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 2.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: parse-server 9.9.1-alpha.13, 8.6.83. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm parse-server: affected >= 9.0.0, < 9.9.1-alpha.13; <= 8.6.82; fixed in 9.9.1-alpha.13, 8.6.83

## Suggested inspection (read-only)
- `npm ls parse-server --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on parse-server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-97pr-9hgg-3p8r (OSV record GHSA-97pr-9hgg-3p8r lists affected ranges: npm parse-server >=9.0.0 =0 <8.6.83 (fixed))
- Verified: https://github.com/advisories/GHSA-97pr-9hgg-3p8r (GitHub-reviewed advisory GHSA-97pr-9hgg-3p8r lists affected ranges: npm parse-server >=9.0.0 =0 <=8.6.82)

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