PayPal PHP Merchant SDK Cross-site scripting (XSS) vulnerability

published 2017-02-23 9 y ago modified 2026-06-17 4 mo ago also GHSA-p4g7-wjhq-9r2h , EUVD-2022-4675

cvss: 6.1; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits: 0; none known

Cross-site scripting (XSS) vulnerability in GetAuthDetails.html.php in PayPal PHP Merchant SDK (aka merchant-sdk-php) 3.9.1 allows remote attackers to inject arbitrary web script or HTML via the token parameter.

Patch / fix

fixed in 1

packagist paypal/merchant-sdk-php 3.12.0

Exploit prediction

1.24% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

github.com https://github.com/paypal/merchant-sdk-php/issues/129 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	6.1	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub	3.0	6.1	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	paypal/merchant-sdk-php	>=3.0.0, <3.12.0	3.12.0

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /paypal/merchant-sdk-php/issues/129
web, exploit, third-party-advisory
securityfocus.com /bid/96432
vdb-entry, web, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2017-6099
advisory
github.com /FriendsOfPHP/security-advisories/blob/master/paypal/merchant-sdk-php/CVE-2017-6099.yaml
web

Sources

CVE List CVE-2017-6099
GitHub Advisory GHSA-p4g7-wjhq-9r2h
NVD CVE-2017-6099

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary