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CVE-2018-1000823

29
FAUCET Score

CVE-2018-1000823 is a critical XML External Entity (XXE) vulnerability affecting exist-db exist versions up to 5.0.0-RC4, specifically within the XML Parser for the REST Server. This flaw allows unauthenticated attackers to remotely exploit the system with low complexity, leading to severe consequences. The potential impact includes disclosure of confidential data, denial of service, Server-Side Request Forgery (SSRF), and port scanning, earning it a CVSS score of 10.0. There is currently no evidence of active exploitation, nor are there public exploit modules or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.0.0CPE matchmatch criteria
cpe:2.3:a:exist-db:exist:*:*:*:*:*:*:*:*
5.0.0CPE matchmatch criteria
cpe:2.3:a:exist-db:exist:5.0.0:rc1:*:*:*:*:*:*
5.0.0CPE matchmatch criteria
cpe:2.3:a:exist-db:exist:5.0.0:rc2:*:*:*:*:*:*
5.0.0CPE matchmatch criteria
cpe:2.3:a:exist-db:exist:5.0.0:rc3:*:*:*:*:*:*
5.0.0CPE matchmatch criteria
cpe:2.3:a:exist-db:exist:5.0.0:rc4:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

10.0CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.88%
Probability of exploitation in next 30 days
EPSS Percentile
77.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0188 is in the 66th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

mavenpatch availablevia ghsa
Product: org.exist-db:exist-coreFixed in: 5.1.0

Vendor Advisories (1)

mavenGHSA-jxm5-5xcw-h57qcritical

exist-db:exist-core XML External Entity (XXE) vulnerability

Dec 20, 2018

References

0dd.zone / 2018/10/27/exist-XXE
Third Party Advisory
github.com / eXist-db/exist/issues/2180
Issue TrackingThird Party Advisory