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CVE-2016-6798

25
FAUCET Score

CVE-2016-6798 describes a critical XML External Entity (XXE) vulnerability in the Apache Sling XSS Protection API module, specifically in versions prior to 1.0.12. The vulnerability arises from the insecure SAX parser used by the XSS.getValidXML() method, which fails to properly validate user input. This allows unauthenticated attackers to remotely exploit the system with low complexity, potentially leading to sensitive data disclosure, server-side request forgery (SSRF), port scanning, or denial of service (DoS). There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.0.10CPE matchmatch criteria
cpe:2.3:a:apache:sling:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.67%
Probability of exploitation in next 30 days
EPSS Percentile
88.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0367 is in the 81st percentile among its peer group of 36,833 CVEs.

Social Chatter

No social media mentions found for this CVE.

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 (2)

mavenpatch availablevia ghsa
Product: org.apache.sling:org.apache.sling.xssFixed in: 1.0.12
mavenpatch availablevia ghsa
Product: org.apache.sling:org.apache.sling.xss.compatFixed in: 1.1.0

Vendor Advisories (1)

mavenGHSA-7g54-vgp6-jj5wcritical

XML External Entity Reference in Apache Sling

May 17, 2022

References

lists.apache.org / thread.html/b72c3a511592ec70729b3ec2d29302b6ce87bbeab62d4745617a6bd0%40%3Cdev.sling.apache.org%3E
securityfocus.com / bid/99873
Third Party AdvisoryVDB Entry