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CVE-2026-126570: Padloc Prototype Pollution Vulnerability

CVE-2026-126570 explained: high Prototype Pollution in Padloc. CVSS 7. Affected versions, detection, fixes and CTEM priority.

Last updated: Nov 11, 2026

CVSS
7 HIGH
EPSS
n/a
CISA KEV
Not listed
CWE
CWE-1321

Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS

CVE-2026-126570 Overview

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.

Critical Impact

Remote, authenticated attackers can exploit this Prototype Pollution in Padloc. The CVSS base score is 7 (High).

Affected Products

  • Padloc: see the vendor advisory for the exact affected versions

Discovery Timeline

  • 2026-11-11: CVE-2026-126570 published to the National Vulnerability Database by disclosure@vulncheck.com
  • 2026-11-11: last updated in the NVD database

Technical Details for CVE-2026-126570

Vulnerability Analysis

CVE-2026-126570 is a Prototype Pollution weakness (CWE-1321: Prototype Pollution) in Padloc. Based on its CVSS vector, the flaw can be reached over the network, needs some level of access, and needs no user interaction. Attacker input changes the base object of a JavaScript application.

With a CVSS base score of 7, apply the vendor fix and confirm exposure on internet facing and business critical assets first.

Root Cause

The weakness is classified as CWE-1321: Prototype Pollution. Attacker input changes the base object of a JavaScript application.

Attack Vector

Based on the CVSS vector, the flaw can be reached over the network, needs some level of access, and needs no user interaction. Attack complexity is low complexity.

No exploitation in the wild is confirmed by CISA at the time of the last update. Check the references below for any vendor or researcher proof of concept.

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/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

Detection Methods for CVE-2026-126570

Detection Strategies

  • Inventory every instance of Padloc and compare the running version with the affected range above.
  • Check external attack surface scans for internet facing instances of the component.
  • Run an authenticated vulnerability scan once your scanner ships a check for this CVE.

Monitoring Recommendations

  • Forward Padloc application, access and audit logs to your SIEM for retrospective hunting.
  • Alert on new processes, configuration changes or outbound connections from the affected service.
  • Track the vendor advisory and the CISA KEV catalog for changes in exploitation status.

How to Mitigate CVE-2026-126570

Immediate Actions Required

  • Apply the fixed version of Padloc named in the vendor advisory.
  • Prioritize internet facing and business critical instances first.
  • Rescan after the change to confirm the exposure is closed.

Patch Information

Use the fixed version listed in the vendor advisory for Padloc.

Workarounds

  • If patching must wait, restrict network access to the affected service and place it behind authentication or a web application firewall rule.

CWE References

Technical References

This entry is built directly from NVD, CISA KEV and EPSS data. Verify fixed versions in the vendor advisory before you deploy.

Frequently asked questions

CVE-2026-126570 is a high severity Prototype Pollution in Padloc with a CVSS score of 7. Apply the vendor fix and confirm exposure on internet facing and business critical assets first.

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