# CVE-2026-121454: Padloc before 4.3.1 Missing SCIM Token Validation via SCIM GET Requests

Status: published. Published: 2026-11-03. Updated: 2026-11-11.

Padloc before 4.3.1 contains a missing authentication vulnerability in ScimServer._handleScimGet() that allows unauthenticated attackers to read SCIM directories by sending any non-empty bearer token. Attackers who know an organization id can query the Users and Groups SCIM endpoints to retrieve provisioned usernames, emails, names, externalIds, and group memberships.

## 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/90dda7c6f417b28bee86ec60eff532eb18870125

## Affected products and versions

- padloc / padloc (padloc/padloc): ≥ 0; < 4.3.1 (affected, semver); 4.3.1 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.3 (medium); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 3.7 (low); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N; source: CNA: VulnCheck

- CVSS 4.0: 6.3 (medium); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/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: 3.7 (low); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.34% as of 2026-11-10; percentile 27.88%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-306

## Exploit evidence

- exploit: https://github.com/padloc/padloc/issues/795 (ADP: CISA-ADP)

## References

- https://github.com/padloc/padloc/issues/795 (CNA: VulnCheck; issue-tracking)

- https://github.com/padloc/padloc (CNA: VulnCheck; product)

- https://github.com/padloc/padloc/commit/90dda7c6f417b28bee86ec60eff532eb18870125 (CNA: VulnCheck; patch)

- https://github.com/padloc/padloc/blob/v4.3.0/packages/server/src/scim.ts#L702-L714 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/padloc-through-4.3.0-missing-scim-token-validation-via-scim-get-requests (CNA: VulnCheck; third-party-advisory)

- https://github.com/padloc/padloc/issues/795 (ADP: CISA-ADP; exploit)

- https://github.com/padloc/padloc (disclosure@vulncheck.com)

- https://github.com/padloc/padloc/blob/v4.3.0/packages/server/src/scim.ts#L702-L714 (disclosure@vulncheck.com)

- https://github.com/padloc/padloc/commit/90dda7c6f417b28bee86ec60eff532eb18870125 (disclosure@vulncheck.com)

- https://github.com/padloc/padloc/issues/795 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/padloc-through-4.3.0-missing-scim-token-validation-via-scim-get-requests (disclosure@vulncheck.com)

- https://github.com/padloc/padloc/issues/795 (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-121454; retrieved 2026-11-11; source updated 2026-11-11

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-121454; retrieved 2026-11-07; source updated 2026-11-07

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-121454; retrieved 2026-11-11; source updated Not reported

Revision: ec44d324f9c15faa7b82f812d5f6c3537f633e904f16c5826580f5ae2cccc388

Canonical: https://y2.dev/cve/CVE-2026-121454

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