CVE-2026-91999Network attack vectorHinoki check available

Authenticated script execution via unescaped console URI

Published Sep 23, 2026 · Updated Sep 23, 2026

Cross-site scripting in Apache Sling XSS Protection before 2.4.12 allows remote authenticated users to execute script in the Web Console. The plugin derives consoleRoot from the request URI and inserts it unescaped into single-quoted script and link attributes, allowing crafted URI text to break out of an attribute. Exploitation requires the optional Felix Web Console and a logged-in user to open a crafted plugin request, after which script runs in the console origin.

CVSS severityUnavailable
Unscored
EPSS probability0.35%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Cross-site scripting in Apache Sling XSS Protection before 2.4.12 allows remote authenticated users to execute script in the Web Console. The plugin derives consoleRoot from the request URI and inserts it unescaped into single-quoted script and link attributes, allowing crafted URI text to break out of an attribute. Exploitation requires the optional Felix Web Console and a logged-in user to open a crafted plugin request, after which script runs in the console origin.

The record

CVE
CVE-2026-91999
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
Apache Software Foundation
Product
Apache Sling XSS Protection
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.4.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Apache Software Foundation · Apache Sling XSS Protectionversion=0 <2.4.12

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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