CVE-2026-80180Network attack vectorHinoki check available

Stored script execution via Markdown HTML processing

Published Sep 4, 2026 · Updated Sep 4, 2026

Stored XSS in Apache Allura 1.20.0 and earlier allows remote attackers to execute script in a viewer's browser via crafted Markdown. The Markdown HTML renderer retains executable SVG content from stored attacker-supplied markup instead of excluding that element class. Exploitation requires permission to save Markdown-bearing content and a user to view the rendered page; Apache has not disclosed the exact parser flaw.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Apache Allura 1.20.0 and earlier allows remote attackers to execute script in a viewer's browser via crafted Markdown. The Markdown HTML renderer retains executable SVG content from stored attacker-supplied markup instead of excluding that element class. Exploitation requires permission to save Markdown-bearing content and a user to view the rendered page; Apache has not disclosed the exact parser flaw.

The record

CVE
CVE-2026-80180
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Apache Software Foundation
Product
Apache Allura
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <=1.20.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Apache Software Foundation · Apache Alluraversion=0 <=1.20.0

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo