Parse Server's Cloud Hooks and Cloud Jobs bypass readOnlyMasterKey write restriction

Exploitation

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

CVSS 4.0

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

EPSS

• CVE-2026-29182: 0.43% estimated exploitation activity in the next 30 days; percentile 37.08 (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 Parse Server's readOnlyMasterKey option allows access with master-level read privileges but is documented to deny all write operations. However, some endpoints incorrectly accept the readOnlyMasterKey for mutating operations. This allows a caller who only holds the readOnlyMasterKey to create, modify, and delete Cloud Hooks and to start Cloud Jobs, which can be used for data exfiltration. Any Parse Server deployment that uses the readOnlyMasterKey option is affected. Note than an attacker needs to know the readOnlyMasterKey to exploit this vulnerability. Patches The fix adds authorization checks, rejecting mutating requests made with the readOnlyMasterKey. Workarounds There is no known workaround other than upgrading. If upgrading is not immediately possible, ensure the readOnlyMasterKey value is not shared with untrusted parties. Resources - GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-vc89-5g3r-cmhh - Fixed in Parse…

Published by the source

5 Mar 2026, 00:33 UTC

Last modified by the source

16 Mar 2026, 03:04 UTC

Source last checked

26 Oct 2026, 12:43 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-vc89-5g3r-cmhh

2. Revision 2 · amended · 25 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-vc89-5g3r-cmhh

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# Patch Next advisory brief: CVE-2026-29182

Advisory: Parse Server's Cloud Hooks and Cloud Jobs bypass `readOnlyMasterKey` write restriction
IDs: CVE-2026-29182, GHSA-vc89-5g3r-cmhh
Record: https://patchnext.com/advisories/cve-2026-29182 (revision 3, source checked 26 Oct 2026, 12:43 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: parse-server 9.4.1-alpha.3, 8.6.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm parse-server: affected >= 9.0.0, <= 9.4.1-alpha.2; <= 8.6.3; fixed in 9.4.1-alpha.3, 8.6.4

## 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-vc89-5g3r-cmhh (OSV record GHSA-vc89-5g3r-cmhh lists affected ranges: npm parse-server >=9.0.0 =0 <8.6.4 (fixed))
- Verified: https://github.com/advisories/GHSA-vc89-5g3r-cmhh (GitHub-reviewed advisory GHSA-vc89-5g3r-cmhh lists affected ranges: npm parse-server >=9.0.0 =0 <=8.6.3)

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