What is CVE-2018-9845?

CVE-2018-9845 is a critical-severity vulnerability in Etherpad Lite, classified under Improper Handling of Case Sensitivity. CVSS score: 9.8/10. Published 2018-04-29.

How severe is CVE-2018-9845?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2018-9845 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Etherpad Lite

CVE-2018-9845

Etherpad Lite before 1.6.4 is exploitable for admin access.

Published 2018-04-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.127 (96.3th percentile), scored 2026-10-31.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.129 · newest: 0.127 · change: -0.002

Affected products

Etherpad Lite

Weakness classification (CWE)

CWE-178 — Improper Handling of Case Sensitivity

Public proof-of-concept exploits

References

github.com/ether/etherpad-lite/commit/ffe24c3dd93efc73e0cbf924db9a0cc40be9511b (Patch, Third Party Advisory)
github.com/ether/etherpad-lite/blob/develop/CHANGELOG.md (Third Party Advisory)

Frequently asked questions

What is CVE-2018-9845?: CVE-2018-9845 is a critical-severity vulnerability in Etherpad Lite, classified under Improper Handling of Case Sensitivity. CVSS score: 9.8/10. Published 2018-04-29.
How severe is CVE-2018-9845?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2018-9845 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.