CVE-2026-91204Network attack vectorHinoki check available

Stored XSS via unvalidated comment link schemes

Published Sep 28, 2026 · Updated Sep 28, 2026

Stored cross-site scripting in Apache Roller 6.1.5 allows remote attackers to execute script when a visitor clicks a crafted comment link. Utilities.transformToHTMLSubset restores an attacker-supplied anchor href during HTML comment formatting without restricting its URI scheme, preserving a javascript: link. Exploitation requires HTML-enabled comments and the HTMLSubset formatter; comment moderation delays publication, and script execution requires a visitor to click the link.

CVSS severity6.1
Medium
EPSS probability0.40%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Stored cross-site scripting in Apache Roller 6.1.5 allows remote attackers to execute script when a visitor clicks a crafted comment link. Utilities.transformToHTMLSubset restores an attacker-supplied anchor href during HTML comment formatting without restricting its URI scheme, preserving a javascript: link. Exploitation requires HTML-enabled comments and the HTMLSubset formatter; comment moderation delays publication, and script execution requires a visitor to click the link.

The record

CVE
CVE-2026-91204
Published
Sep 28, 2026
Updated
Sep 28, 2026
Vendor
The Apache Software Foundation
Product
Apache Roller
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 28, 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=6.1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Rollerversion=6.1.5

Published CVSS scores

6.1Apache Software FoundationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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