Cross-site Scripting in Apache Sling XSS Protection API

published 2018-01-10 8 y ago modified 2026-06-17 4 mo ago also GHSA-7mfw-43c4-45mq , EUVD-2022-3033

cvss: 6.1; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.9%; EPSS 2.9% chance of exploitation in 30 days, percentile 87%
public exploits: 0; none known

A flaw in the way URLs are escaped and encoded in the org.apache.sling.xss.impl.XSSAPIImpl#getValidHref and org.apache.sling.xss.impl.XSSFilterImpl#isValidHref allows special crafted URLs to pass as valid, although they carry XSS payloads. The affected versions are Apache Sling XSS Protection API 1.0.4 to 1.0.18, Apache Sling XSS Protection API Compat 1.1.0 and Apache Sling XSS Protection API 2.0.0.

Patch / fix

fixed in 1

maven org.apache.sling:org.apache.sling.xss 2.0.4

Exploit prediction

2.91% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

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
maven	org.apache.sling:org.apache.sling.xss	>=1.0.4, <2.0.4	2.0.4
maven	org.apache.sling:org.apache.sling.xss.compat	1 listed version	no fix listed

Affected products

Apache Software Foundation Apache Sling

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

s.apache.org /CVE-2017-15717
mailing-list, web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2017-15717
advisory

Sources

Fencer Vulns 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