CVE-2018-1000823

exist version <= 5.0.0-RC4 contains a XML External Entity (XXE) vulnerability in XML Parser for REST Server that can result in Disclosure of confidential data, denial of service, SSRF, port scanning.

Published: 2018-12-20 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-1000823 is rated High Risk (68.5/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.88%). EPSS rose +1.63% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-1000823

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.24% 1.88% +1.63%
2 2025-03-30 0.48% 0.24% -0.23%
3 2025-03-29 — 0.48% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-1000823

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 6.0 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2018-1000823

GitHub Security Advisory for CVE-2018-1000823

GHSA-jxm5-5xcw-h57q · Severity: critical · Ecosystem: maven — exist-db:exist-core XML External Entity (XXE) vulnerability

Affected software / configurations for CVE-2018-1000823

Vendor Product Version Raw CPE
exist-db exist < 5.0.0 cpe:2.3:a:exist-db:exist:*:*:*:*:*:*:*:*
exist-db exist 5.0.0 cpe:2.3:a:exist-db:exist:5.0.0:rc1:*:*:*:*:*:*
exist-db exist 5.0.0 cpe:2.3:a:exist-db:exist:5.0.0:rc2:*:*:*:*:*:*
exist-db exist 5.0.0 cpe:2.3:a:exist-db:exist:5.0.0:rc3:*:*:*:*:*:*
exist-db exist 5.0.0 cpe:2.3:a:exist-db:exist:5.0.0:rc4:*:*:*:*:*:*

References for CVE-2018-1000823

URL Tags
https://0dd.zone/2018/10/27/exist-XXE/ Third Party Advisory
https://github.com/eXist-db/exist/issues/2180 Issue Tracking Third Party Advisory
cvelogic Threat Intelligence