CVE-2026-55089
Authorization bug in Etherpad lets non-admin users invoke admin API functions.
Is CVE-2026-55089 being exploited?
Not confirmed. CVE-2026-55089 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2026-55089?
CVE-2026-55089 is rated Critical with a CVSS score of 9.9. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-55089?
Yes. A fix has been recorded for CVE-2026-55089. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-55089 affect?
CVE-2026-55089 affects Etherpad 2.1.0 - 3.0.x, Etherpad < 3.1.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55089?
Upgrade to Etherpad 3.1.0; revoke/reissue OAuth tokens and restrict /api/2/* until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated non-admins can call admin APIs to read, modify, delete, copy, restore, or anonymize pads across the instance.
Immediate action required
- affected>= 2.1.0 and < 3.1.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.