CVE-2026-107503 Eclipse Ditto CVE debrief

Who should care

Defenders responsible for Eclipse Ditto installations, particularly those using the Ditto Explorer UI, should be aware of this vulnerability and take steps to verify and update their installations.

Why it matters

CVE-2026-107503 is a high-severity vulnerability in Eclipse Ditto's Ditto Explorer UI that allows for OAuth authorization code and PKCE verifier theft, potentially leading to account takeover. Defenders should prioritize verifying and updating affected installations to prevent potential security breaches.

• Potential account takeover due to OAuth authorization code and PKCE verifier theft.
• Possible unauthorized access to sensitive information.
• Required verification of affected Eclipse Ditto installations.
• Potential disruption to services using Eclipse Ditto.

Technical summary

The vulnerability exists in the Ditto Explorer UI of Eclipse Ditto, where an attacker can craft a link to set an attacker-controlled OIDC authority with autoSso enabled. This allows the attacker to steal the OAuth authorization code and PKCE verifier, potentially leading to account takeover. The vulnerability affects versions 3.6.0 to 3.9.7 of Eclipse Ditto. Defenders should prioritize verifying and updating affected Eclipse Ditto installations to prevent potential account takeovers. The configuration is persisted, later visits to the UI without the crafted link repeat the token theft. An attacker-controlled api_uri causes the UI to send the victim's bearer token or Basic credentials to the attacker.

Defensive priority

Defenders should prioritize verifying and updating affected Eclipse Ditto installations to prevent potential account takeovers.

Recommended defensive actions

• Verify and update affected Eclipse Ditto installations to version 3.9.8 or later.
• Implement additional security measures, such as monitoring for suspicious activity and restricting access to the Ditto Explorer UI.
• Review and update security configurations to prevent similar vulnerabilities.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description, affected versions, and potential impact. However, additional information from vendor sources may be necessary to fully understand the vulnerability and its implications.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.