CVE-2026-55087Medium· 6.1▾ TwilightPoC availableEtherpad is a real-time collaborative editor. From 2.1.0 until 3.1.0, Etherpad uses the attacker-controlled x-proxy-path request header in src/node/hooks/express/admin.ts when substituting paths into HTML, JavaScript, and CSS under /admi…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 33.6 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Exploit-prediction probability, daily snapshots since Aug 20.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.6%
Nuclei ×1
Last analysed / modified upstream
Etherpad is a real-time collaborative editor. From 2.1.0 until 3.1.0, Etherpad uses the attacker-controlled x-proxy-path request header in src/node/hooks/express/admin.ts when substituting paths into HTML, JavaScript, and CSS under /admin without sanitization, Vary: x-proxy-path, or Cache-Control: private, no-store. A shared proxy or CDN can cache the resulting response and serve attacker-injected script to an administrator. In src/node/hooks/express/specialpages.ts, version 3.0.0 also accepts a protocol-relative x-proxy-path value when constructing the /p/:pad/timeslider redirect, allowing redirection to an attacker-controlled host. The issues are exploitable when the deployment permits client-supplied x-proxy-path headers to reach Etherpad. This issue is fixed in version 3.1.0.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
ep_etherpad-lite >= 2.1.0, <= 3.0.0Patched in:
ep_etherpad-lite 3.1.0Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-55088Medium· 6.8Etherpad is a real-time collaborative editor
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CVE-2026-55090HighEtherpad is a real-time collaborative editor
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