What is CVE-2018-1000834?

CVE-2018-1000834 is a critical-severity vulnerability in Runelite, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.0/10. Published 2018-12-20.

How severe is CVE-2018-1000834?

Critical severity. CVSS v3 base score is 9.0 out of 10.

XXE in Runelite

CVE-2018-1000834

runelite version <= runelite-parent-1.4.23 contains a XML External Entity (XXE) vulnerability in Man in the middle runscape services call that can result in Disclosure of confidential data, denial of service, SSRF, port scanning.

Vulnerability class: XXE (XML External Entity)

Published 2018-12-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.014 (71.0th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Runelite

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

github.com/runelite/runelite/issues/6160 (Third Party Advisory, Issue Tracking)
0dd.zone/2018/10/28/runelite-XXE-MitM/ (Third Party Advisory)

Frequently asked questions

What is CVE-2018-1000834?: CVE-2018-1000834 is a critical-severity vulnerability in Runelite, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.0/10. Published 2018-12-20.
How severe is CVE-2018-1000834?: Critical severity. CVSS v3 base score is 9.0 out of 10.