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CVE-2018-1000844

27
FAUCET Score

CVE-2018-1000844 is a critical XML External Entity (XXE) vulnerability affecting Square Open Source Retrofit versions prior to commit 4a693c5aeeef2be6c7ecf80e7b5ec79f6ab59437. This flaw, rated 9.1 CRITICAL (CVSSv3), allows an unauthenticated attacker to remotely read arbitrary files from the filesystem or perform Server-Side Request Forgery (SSRF) attacks without user interaction. While the vulnerability has a high FAUCET Risk Score of 73/100, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage. The issue has been patched in later versions of Retrofit.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.4.0, < 2.5.0CPE matchmatch criteria
cpe:2.3:a:squareup:retrofit:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.1CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.15%
Probability of exploitation in next 30 days
EPSS Percentile
80.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0215 is in the 69th 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: com.squareup.retrofit2:retrofitFixed in: 2.5.0

Vendor Advisories (2)

mavenGHSA-j379-9jr9-w5cqcritical

XML External Entity (XXE) vulnerability in Square Retrofit

Dec 21, 2018
redhatCVE-2018-1000844Moderate

retrofit: XML external entity processing vulnerability in JAXB

Apr 17, 2018

References

github.com / square/retrofit/pull/2735
Third Party Advisory