# CVE-2026-126570: Padloc 4.0.0 before 4.3.1 Prototype Pollution via SCIM PATCH setPath()

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

Padloc 4.0.0 before 4.3.1 contains a prototype pollution vulnerability that allows SCIM token holders to modify Object.prototype by sending crafted SCIM PATCH paths to ScimServer._handleScimUsersPatch(). Attackers can supply paths like __proto__.x or constructor.prototype.x passed to setPath() to pollute the shared server process, disrupting requests for all other organizations.

## 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/padloc/padloc/commit/7dd3d230ef299c71ac215c802600b5f2358f7ba3

## Affected products and versions

- padloc / padloc (padloc/padloc): ≥ 4.0.0; < 4.3.1 (affected, semver); 4.3.1 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 7 (high); CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:H/SC:N/SI:L/SA:H; source: CNA: VulnCheck

- CVSS 3.1: 7.6 (high); CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H; source: CNA: VulnCheck

- 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/padloc/padloc/security/advisories/GHSA-crhv-mjrg-8vwm (CNA: VulnCheck; vendor-advisory)

- https://github.com/padloc/padloc/commit/7dd3d230ef299c71ac215c802600b5f2358f7ba3 (CNA: VulnCheck; patch)

- https://github.com/padloc/padloc/blob/v4.3.0/packages/server/src/scim.ts#L421-L428 (CNA: VulnCheck; technical-description)

- https://github.com/padloc/padloc/blob/v4.3.0/packages/core/src/util.ts#L239-L251 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/padloc-4.0.0-before-4.3.1-prototype-pollution-via-scim-patch-setpath (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-126570; retrieved 2026-11-11; source updated 2026-11-11

Revision: a112d2d5a605e888afeb3fdcef022c973f957b6fa5794d8db4ccf8d31187085e

Canonical: https://y2.dev/cve/CVE-2026-126570

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