CVE-2026-107503 Open redirect in Ditto Explorer UI
Attackers can steal user tokens by tricking victims into visiting a crafted link that redirects authentication to a malicious server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-107503?
CVE-2026-107503 is a high-severity vulnerability in Eclipse Ditto Ditto Explorer UI, published on 8 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
In Eclipse Ditto versions 3.6.0 to 3.8.13 and 3.9.0 to 3.9.7, the Ditto Explorer UI loads its complete environment configuration, including the Ditto API URI and the OpenID Connect (OIDC) provider settings, from an arbitrary cross-origin URL supplied in the environmentsURL query parameter. It adopts this configuration without user confirmation and persists it in the browser's localStorage. A crafted link can therefore set an attacker-controlled OIDC authority with autoSso enabled. The UI then automatically starts a login at the genuine identity provider but exchanges the returned authorization code together with its PKCE code_verifier at an attacker-controlled token endpoint. This lets the attacker redeem the code for the victim's access and refresh tokens. Alternatively, an attacker-controlled api_uri causes the UI to send the victim's bearer token or Basic credentials to the attacker. Because the configuration is persisted, later visits to the UI without the crafted link repeat the token theft. In versions 3.9.0 to 3.9.7, the Swagger UI OIDC integration of the Helm chart and the Docker Compose deployment is affected in the same way, but requires the user to start the login. The issue is fixed in 3.8.14 and 3.9.8.
Which versions are affected by CVE-2026-107503?
How do I fix CVE-2026-107503?
No fix has been published for CVE-2026-107503 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-107503 being exploited?
There is no known exploitation of CVE-2026-107503 in the wild and no public exploit code.
Sources
Also known as GHSA-8767-g5qv-9jcf, GHSA-g8w6-jp67-cwcc.