CVE-2026-59994Network attack vectorHinoki check available

Unauthenticated HTML injection via unescaped email notification bodies

Published Oct 15, 2026 · Updated Oct 15, 2026

HTML injection in EspoCRM before 9.3.9 allows remote attackers to alter stream notification emails via crafted incoming email. The processNotificationNoteEmailReceived method applies nl2br to stored plain-text email bodies without escaping HTML before inserting them into Email Received notifications. Exploitation requires a monitored mailbox and record followers receiving notifications; JavaScript executes only when the recipient views the message in a mail client that permits it.

CVSS severity4.3
Medium
EPSS probability0.34%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

HTML injection in EspoCRM before 9.3.9 allows remote attackers to alter stream notification emails via crafted incoming email. The processNotificationNoteEmailReceived method applies nl2br to stored plain-text email bodies without escaping HTML before inserting them into Email Received notifications. Exploitation requires a monitored mailbox and record followers receiving notifications; JavaScript executes only when the recipient views the message in a mail client that permits it.

The record

CVE
CVE-2026-59994
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
EspoCRM
Product
EspoCRM
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 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=< 9.3.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EspoCRM · EspoCRMversion=< 9.3.9

Published CVSS scores

4.3GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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')
T1203Exploitation for Client Execution

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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