CVE-2026-55087 Details.
Etherpad 2.1.0 <= 3.0.0 - Cross-Site Scripting
Atlas does not check this one. Works by exploiting the flaw.
The only reliable test for this one is to try the weakness itself, which can disturb the site. Atlas does not do that, so it does not run this check.
About CVE-2026-55087. What It Means.
Etherpad versions 2.1.0 through 3.0.0 reflect the x-proxy-path request header into admin HTML, JavaScript, and CSS responses without sanitization. An attacker can abuse this behavior to inject crafted content into generated resource URLs, enabling cross-site scripting and cache poisoning scenarios.
Affected Product. What Is Hit.
- Vendor
- ether
- Product
- Ether Etherpad
FAQ
Common Questions.
Etherpad 2.1.0 <= 3.0.0 - Cross-Site Scripting. Etherpad versions 2.1.0 through 3.0.0 reflect the x-proxy-path request header into admin HTML, JavaScript, and CSS responses without sanitization. An attacker can abuse this behavior to inject crafted content into generated resource URLs, enabling cross-site scripting and cache poisoning scenarios.
No. The only reliable test for this one is to try the weakness itself, which can disturb the site. Atlas does not do that, so it does not run this check. The facts about CVE-2026-55087 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-55087 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update Ether Etherpad 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-2026-55087. Atlas does not run a check for it, so nothing here says whether a particular site is affected.