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☕
☕ Maven
Not in CISA KEV
HIGH severity

CVE-2018-13439 — wxpay-sdk

HIGH

CVE-2018-13439 is a high-severity (CVSS 7.5) XML External Entity (XXE) vulnerability in com.github.wxpay:wxpay-sdk. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

WeChat Pay Java SDK allows XXE

Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
1 known
Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs80th percentile — riskier than 80% of all scored CVEsHighest risk
0.00%0.80%1.60%2.40%0.3%1.9%May 26Sep 26Nov 26

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.wxpay:wxpay-sdk

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

WXPayUtil in WeChat Pay Java SDK allows XXE attacks involving a merchant notification URL.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
☕Mavencom.github.wxpay:wxpay-sdkall versionsNo fix

Affected Products

1 product · 1 configurations
Application
wechat paytencent
all
Exploits & PoCs
1

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

WXPayUtil in WeChat Pay Java SDK allows XXE attacks involving a merchant…

packetstormsecurity.comNVDSep 2018

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Remediation status

    The records we use list no patched version of com.github.wxpay:wxpay-sdk for CVE-2018-13439. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    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

WXPayUtil in WeChat Pay Java SDK allows XXE attacks involving a merchant notification URL.
O3 Security · Impact-Aware SCA

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CVE-2018-13439: wxpay-sdk XXE (High 7.5)