CVE-2026-72559Network attack vector

Stored XSS via unsafe Parsedown note rendering

Published Aug 11, 2026 · Updated Aug 11, 2026

Stored cross-site scripting in HortusFox 5.9 allows remote authenticated users to inject persistent JavaScript through plant notes. The plant-note renderer passes note content to Parsedown without safe mode and emits the resulting markup unescaped into each viewer's browser. Workspace membership and a victim viewing the affected plant are required, after which the injected script can read session cookies or act with the victim's privileges, including an administrator's.

CVSS severity5.4
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in HortusFox 5.9 allows remote authenticated users to inject persistent JavaScript through plant notes. The plant-note renderer passes note content to Parsedown without safe mode and emits the resulting markup unescaped into each viewer's browser. Workspace membership and a victim viewing the affected plant are required, after which the injected script can read session cookies or act with the victim's privileges, including an administrator's.

The record

CVE
CVE-2026-72559
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
Daniel Brendel
Product
HortusFox
Classifications
CWE-79, T1539
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 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 <=5.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Daniel Brendel · HortusFoxversion=0 <=5.9

Published CVSS scores

5.4TuranSecCVSS:3.1/AV:N/AC:L/PR:L/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Cross-site Scripting
T1539Steal Web Session Cookie

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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