How severe is GHSA-h755-h99p-9ffv?

GHSA-h755-h99p-9ffv has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by GHSA-h755-h99p-9ffv?

GHSA-h755-h99p-9ffv affects the following packages: com.github.binarywang:weixin-java-common (Maven). Ecosystems affected: Maven.

How do I fix GHSA-h755-h99p-9ffv?

Update com.github.binarywang:weixin-java-common to 3.3.2.B or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h755-h99p-9ffv is resolved across your whole dependency graph.

How do I detect GHSA-h755-h99p-9ffv in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.github.binarywang:weixin-java-common, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-h755-h99p-9ffv if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is GHSA-h755-h99p-9ffv actively exploited in the wild?

Yes. There are 1 known exploit references for GHSA-h755-h99p-9ffv, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for GHSA-h755-h99p-9ffv?

GHSA-h755-h99p-9ffv has an EPSS (Exploit Prediction Scoring System) score of 1.7%, placing it in the 77th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-h755-h99p-9ffv?

GHSA-h755-h99p-9ffv is classified as XML External Entity (XXE) (CWE-611). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-h755-h99p-9ffv published, and has it been updated?

GHSA-h755-h99p-9ffv was published on May 14, 2022 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

CRITICAL severity

XML External Entity Reference in weixin-java-toolsGHSA-h755-h99p-9ffv

CRITICALFix: Wechat-Group/WxJava@8ec61d1

GHSA-h755-h99p-9ffv is a critical-severity (CVSS 9.8) XML External Entity (XXE) vulnerability in com.github.binarywang:weixin-java-common. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for com.github.binarywang:weixin-java-common — see the affected versions and patch details below.

Also known asCVE-2019-5312

Published

May 14, 2022

Updated

Sep 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

1 known

Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

1.7%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs77th percentile — riskier than 77% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

☕com.github.binarywang:weixin-java-common

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

An issue was discovered in weixin-java-tools v3.3.0. There is an XXE vulnerability in the getXmlDoc method of the BaseWxPayResult.java file. NOTE: this issue exists because of an incomplete fix for CVE-2018-20318.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`com.github.binarywang:weixin-java-common`	all versions	3.3.2.B`com.github.binarywang:weixin-java-common:3.3.2.B`

Affected Products

1 product · 1 configurations

Application

wxjavawxjava_project

< 3.4.0

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

An issue was discovered in weixin-java-tools v3.3.0. There is an XXE vul…

github.comNVDJan 2019

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.github.binarywang:weixin-java-common, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update com.github.binarywang:weixin-java-common to 3.3.2.B or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h755-h99p-9ffv is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

An issue was discovered in weixin-java-tools. There is an XXE vulnerability in the getXmlDoc method of the BaseWxPayResult.java file. NOTE: this issue exists because of an incomplete fix for CVE-2018-20318.

O3 Security · Impact-Aware SCA

Is GHSA-h755-h99p-9ffv in your dependencies?

Find it across Maven, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

9.8/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Raw vector

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

CWE Classification

CWE-611XML External Entity (XXE)

Weaponization

No Nuclei template or Metasploit module yet. 1 public proof-of-concept reference is listed on this page.

OpenSSF Scorecard

Package health score

WxJava

5.3/10

Maintained10/10

Code-Review3/10

Branch-ProtectionN/A

Assessed Nov 9, 2026

Timeline

First exploit

Jan 16, 2019

Disclosed

May 14, 2022

Last updated

Sep 10, 2026

Identifiers

GHSA-h755-h99p-9ffv

References

Advisorynvd.nist.gov · CVE 2019 5312 Webgithub.com Webgithub.com Webgithub.com · 8ec61d1328f50e23cd14285a950ca57a088b32b2

Related vulnerabilities

This CVE is critical severity; 1 of 8 other CVEs with CWE-611 is rated as high or higher (top: critical).

CVE-2026-126062CVE-2026-108358CVE-2026-108357CVE-2026-61586CVE-2026-61741CVE-2026-61570CVE-2026-55848CVE-2026-54079Browse all CWE-611

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedSep 10, 2026

XML External Entity Reference in weixin-java-toolsGHSA-h755-h99p-9ffv

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is GHSA-h755-h99p-9ffv in your dependencies?