---
title: "CVE-2026-107503: Eclipse Ditto Ditto Explorer - Authentication Bypass"
description: "Eclipse Ditto Ditto Explorer [3.6.0,3.9.7] contains an OAuth authorization code and PKCE verifier theft vulnerability caused by unvalidated environment URLs allowing injected OIDC authority, letting attackers take over accounts by redeeming tokens, exploit requires crafted link with attacker-controlled OIDC authority and autoSso enabled."
url: https://panop.io/threat-heartbeat/CVE-2026-107503/
---

# CVE-2026-107503 Eclipse Ditto Ditto Explorer - Authentication Bypass

Eclipse Ditto Ditto Explorer \[3.6.0,3.9.7\] contains an OAuth authorization code and PKCE verifier theft vulnerability caused by unvalidated environment URLs allowing injected OIDC authority, letting attackers take over accounts by redeeming tokens, exploit requires crafted link with attacker-controlled OIDC authority and autoSso enabled.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.18% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-107503)

## Details

Type

Authentication Bypass

Impact

Information Disclosure, Broken Authentication

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:L/VA:N/SC:H/SI:H/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

Published

8 October 2026

Updated

15 October 2026

Weakness

[CWE-15](https://cwe.mitre.org/data/definitions/15.html)

## Vendor fix

Update to a version later than 3.9.7 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-107503](https://nvd.nist.gov/vuln/detail/CVE-2026-107503)
- [https://github.com/eclipse-ditto/ditto/commit/d4e51ba20e53c73e3b24e64d4aca57f6079d9ca1](https://github.com/eclipse-ditto/ditto/commit/d4e51ba20e53c73e3b24e64d4aca57f6079d9ca1)
- [https://github.com/eclipse-ditto/ditto/commit/ee65b8cd9b7219401dcac2c25b79adc8cee4a5ba](https://github.com/eclipse-ditto/ditto/commit/ee65b8cd9b7219401dcac2c25b79adc8cee4a5ba)
- [https://github.com/eclipse-ditto/ditto/security/advisories/GHSA-8767-g5qv-9jcf](https://github.com/eclipse-ditto/ditto/security/advisories/GHSA-8767-g5qv-9jcf)
- [https://gitlab.eclipse.org/security/cve-assignment/-/work\_items/380](https://gitlab.eclipse.org/security/cve-assignment/-/work_items/380)
- [https://gitlab.eclipse.org/security/vulnerability-reports/-/work\_items/1207](https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/1207)
- [https://eclipse.dev/ditto/release\_notes\_3814.html](https://eclipse.dev/ditto/release_notes_3814.html)
- [https://eclipse.dev/ditto/release\_notes\_398.html](https://eclipse.dev/ditto/release_notes_398.html)
- [https://github.com/eclipse-ditto/ditto/commit/71061f0b01df596fad80fb24502eb1e852ea6909](https://github.com/eclipse-ditto/ditto/commit/71061f0b01df596fad80fb24502eb1e852ea6909)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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