CVE-2026-55154Public exploitNetwork attack vectorHinoki check available

Data disclosure via whitespace-prefixed export formulas

Published Oct 15, 2026 · Updated Oct 15, 2026

Formula injection in EspoCRM exports before 9.3.9 allows remote authenticated users to disclose data via crafted spreadsheet cells. The CSV and XLSX processors' sanitizeCellValue() methods inspect only the first byte, omitting the protective single quote when whitespace or control characters precede a formula trigger. Exploitation requires permission to store exported text and a privileged user opening the export and accepting applicable spreadsheet prompts; command execution additionally requires legacy DDE-enabled spreadsheet configurations.

CVSS severity5.4
Medium
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Formula injection in EspoCRM exports before 9.3.9 allows remote authenticated users to disclose data via crafted spreadsheet cells. The CSV and XLSX processors' sanitizeCellValue() methods inspect only the first byte, omitting the protective single quote when whitespace or control characters precede a formula trigger. Exploitation requires permission to store exported text and a privileged user opening the export and accepting applicable spreadsheet prompts; command execution additionally requires legacy DDE-enabled spreadsheet configurations.

The record

CVE
CVE-2026-55154
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
EspoCRM
Product
EspoCRM
Classifications
CWE-1236, T1204.002
Attack vector
network
Privileges
authenticated

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 privilegesauthenticated

What is affected?

EspoCRM · EspoCRMversion=< 9.3.9

Published CVSS scores

5.4GitHub CNACVSS: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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1236Improper Neutralization of Formula Elements in a CSV File
T1204.002Malicious File

Public exploit references

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Technologies

Your stack

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Your stack

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