CVE-2026-44401Public exploitNetwork attack vector

Stored XSS via unvalidated Markdown link schemes

Published Aug 10, 2026 · Updated Aug 10, 2026

Stored XSS in Typemill 2.0.0 through 2.23.0 allows remote authenticated users to run JavaScript when visitors click crafted Markdown links. ParsedownExtension::inlineLink assigns an attacker-controlled href to an anchor without validating its URI scheme, preserving a javascript URI in stored theme content. Theme-configuration access is required, and execution occurs only after a visitor clicks the link, exposing that visitor's session and authenticated actions.

CVSS severity4.6
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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 Typemill 2.0.0 through 2.23.0 allows remote authenticated users to run JavaScript when visitors click crafted Markdown links. ParsedownExtension::inlineLink assigns an attacker-controlled href to an anchor without validating its URI scheme, preserving a javascript URI in stored theme content. Theme-configuration access is required, and execution occurs only after a visitor clicks the link, exposing that visitor's session and authenticated actions.

The record

CVE
CVE-2026-44401
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
Typemill
Product
Typemill
Classifications
CWE-79, T1539
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=2.0.0 <=2.23.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Typemill · Typemillversion=2.0.0 <=2.23.0

Published CVSS scores

4.6VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L
4.8NVDCVSS:3.1/AV:N/AC:L/PR:H/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.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1539Steal Web Session Cookie

Public exploit references

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