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Apache Roller EUVDEUVD-2026-88126

| CVE-2026-91204 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-09-25 GHSA-xg59-jgm4-xmq5
XSS Apache Java
6.1
CVSS 3.1 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
6.1 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
vuln.today AI
6.1 MEDIUM

Anonymous network comment posting gives PR:N/AV:N/AC:L; victim must click the link (UI:R); script crosses into visitor's browser context (S:C) with limited C/I impact and no availability effect.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (CNA).

CVSS VectorVendor

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

4
CVSS changed
Sep 28, 2026 - 08:22 NVD
6.1 (MEDIUM)
Metadata Corrected
Sep 25, 2026 - 22:40 vuln.today
tag: Java added
Analysis Generated
Sep 25, 2026 - 22:15 vuln.today
CVE Published
Sep 25, 2026 - 21:46 oss-security
HIGH

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

Articles & Coverage 4

News 13 New Apache Tomcat Vulnerabilities - 7 Critical, 6 High Severity Sep 26, 2026 News 13 New Jenkins Vulnerabilities - 7 Critical, 6 High Severity Sep 26, 2026 News 13 New Apache Vulnerabilities - 7 Critical, 6 High Severity Sep 26, 2026 News 13 New Jenkins Vulnerabilities - 7 Critical, 6 High Severity Sep 25, 2026

AnalysisAI

Stored cross-site scripting in Apache Roller 6.1.5 lets an unauthenticated remote attacker post a comment containing a javascript: URI that survives HTML comment formatting and executes in the browser of any visitor who clicks the crafted link. Exploitation is gated by a non-default configuration - the site must enable HTML in comments (users.comments.htmlenabled=true) and use the HTMLSubset comment formatter - and by required user interaction, while comment moderation, where enabled, delays publication of the malicious comment. …

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Attack ChainAIDerived

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Vulnerability AssessmentAI

Exploitation Exploitation requires a specific non-default configuration: the target Roller site must have HTML enabled in comments (users.comments.htmlenabled=true) AND use the HTMLSubset comment formatter. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a stored/reflected-hybrid XSS (CWE-79) rated Moderate by Apache with an NVD-style CVSS 3.1 of 6.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: upgrade Apache Roller to 6.1.6 or later, which restricts restored links to http, https and mailto URIs; the upstream change is https://github.com/apache/roller/pull/190 and advisories are at https://roller.apache.org/ and https://seclists.org/oss-sec/2026/q3/955. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify any Apache Roller 6.1.5 instances with users.comments.htmlenabled=true and the HTMLSubset comment formatter; if found, immediately set users.comments.htmlenabled=false or enable comment moderation, and apply the vendor patch (6.1.6) if feasible. …

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EUVD-2026-88126 vulnerability details – vuln.today
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