# CVE-2026-121965: Parse Server before 8.6.113 and 9.10.6-alpha.5 Prototype Pollution via Dot Notation Key

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

Parse Server before 8.6.113 and 9.0.0 before 9.10.6-alpha.5 contains a prototype pollution vulnerability when building objects for Cloud Code triggers and LiveQuery, where a dot notation key whose intermediate segment resolves through an inherited member writes onto a process-wide built-in. Clients with write access to an object in a class with a trigger or LiveQuery can corrupt a built-in function, making unrelated requests fail until restart and denying service to all clients and hosted applications.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/parse-community/parse-server/pull/10810
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/parse-community/parse-server/pull/10811

## Affected products and versions

- parse-community / parse-server (parse-server): ≥ 9.0.0; < 9.10.6-alpha.5 (affected, semver); 9.10.6-alpha.5 (unaffected, semver). Source: CNA: VulnCheck
- parse-community / parse-server (parse-server): ≥ 0; < 8.6.113 (affected, semver); 8.6.113 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6 (medium); CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H; source: CNA: VulnCheck

- CVSS 4.0: 6 (medium); CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/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; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-1321

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/parse-community/parse-server/security/advisories/GHSA-95hp-82c6-25q5 (CNA: VulnCheck; vendor-advisory)

- https://github.com/parse-community/parse-server/pull/10810 (CNA: VulnCheck; patch, issue-tracking)

- https://github.com/parse-community/parse-server/pull/10811 (CNA: VulnCheck; patch, issue-tracking)

- https://www.vulncheck.com/advisories/parse-server-before-8.6.113-and-9.10.6-alpha.5-prototype-pollution-via-dot-notation-key (CNA: VulnCheck; third-party-advisory)

- https://github.com/parse-community/parse-server/pull/10810 (disclosure@vulncheck.com)

- https://github.com/parse-community/parse-server/pull/10811 (disclosure@vulncheck.com)

- https://github.com/parse-community/parse-server/security/advisories/GHSA-95hp-82c6-25q5 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/parse-server-before-8.6.113-and-9.10.6-alpha.5-prototype-pollution-via-dot-notation-key (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-121965; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-121965; retrieved 2026-11-04; source updated 2026-11-04

Revision: f38d5a78779935871efc1f4b0c5529bfb3808db81928317fb86b5a48dc898058

Canonical: https://y2.dev/cve/CVE-2026-121965

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