CVE-2026-40242 Details.
Arcane <= 1.17.2 - Server-Side Request Forgery
Atlas does not check this one. Needs an outside server.
To test for this one, the site would have to contact a server outside your network and report back. Atlas does not run checks that need that, so it does not run this one.
About CVE-2026-40242. What It Means.
Arcane <= 1.17.3 contains an unauthenticated server-side request forgery caused by lack of URL scheme and host validation in /api/templates/fetch endpoint, letting remote attackers perform SSRF, exploit requires no authentication.
Affected Product. What Is Hit.
- Vendor
- getarcaneapp
- Product
- Getarcaneapp Arcane
References. Where To Read More.
More CVEs In Getarcaneapp Arcane.
FAQ
Common Questions.
Arcane <= 1.17.2 - Server-Side Request Forgery. Arcane <= 1.17.3 contains an unauthenticated server-side request forgery caused by lack of URL scheme and host validation in /api/templates/fetch endpoint, letting remote attackers perform SSRF, exploit requires no authentication.
No. To test for this one, the site would have to contact a server outside your network and report back. Atlas does not run checks that need that, so it does not run this one. The facts about CVE-2026-40242 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-40242 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update Getarcaneapp Arcane to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-40242. Atlas does not run a check for it, so nothing here says whether a particular site is affected.