CVE-2026-55154 EspoCRM: CSV/Formula Injection sanitizer bypass via leading whitespace/control characters in export
Authenticated users can bypass CSV/XLSX export sanitization to inject formulas, potentially leading to data disclosure or code execution when exported files are opened.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-55154?
CVE-2026-55154 is a medium-severity vulnerability in espocrm, published on 15 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
EspoCRM is an open source customer relationship management application. Prior to 9.3.9, application/Espo/Tools/Export/Format/Csv/Processor.php, application/Espo/Tools/Export/Format/Xlsx/OpenSpoutProcessor.php, and application/Espo/Tools/Export/Format/Xlsx/PhpSpreadsheetProcessor.php inspect only the first byte in sanitizeCellValue(). An authenticated low-privileged user can store a free-text value whose formula trigger is preceded by whitespace or a control character, causing CSV or XLSX export to omit the leading single-quote formula-neutralization prefix. When a privileged user opens the exported file and accepts applicable spreadsheet security prompts, spreadsheet software can ignore the whitespace or control-character prefix and evaluate the cell as a formula, permitting outbound data disclosure and, on legacy configurations with DDE enabled, command execution. This issue is fixed in version 9.3.9.
Weakness: CWE-1236
Which versions are affected by CVE-2026-55154?
How do I fix CVE-2026-55154?
No fix has been published for CVE-2026-55154 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-55154 being exploited?
There is no known exploitation of CVE-2026-55154 in the wild and no public exploit code.
Sources
Also known as GHSA-xrwp-2gph-985x.