vulnerability / NVI-00002756 / Revision 2
FacturaScripts: CSV formula injection in CSVExport allows authenticated low-priv users to plant payloads that execute when an admin opens the export
OSV carries this publisher advisory for facturascripts/facturascripts. This is an aggregated source copy; consult the original publisher and compare update dates.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
facturascripts/facturascripts
source listedECOSYSTEM: introduced 0; fixed 2026.2
## Summary > **Live PoC verified 2026-04-30** against a stock FacturaScripts master at `127.0.0.1:8081`. A low-privilege user (`lowpriv`) created a customer with `nombre = "=SUM(1+1)*cmd|/c calc!A1"`. An admin then exported `ListCliente` to CSV via `?action=export&option=CSV`. The downloaded file contains the raw payload as the first cell of the `nombre` column, with no leading single quote and no escape. Excel and LibreOffice will execute the formula on open, including DDE invocations such as `=cmd|'/c calc'!A1` that spawn arbitrary processes on the admin workstation. `Core/Lib/Export/CSVExport.php::writeData()` wraps every cell in the configured delimiter (`"`) and concatenates without inspecting the first character of the value. Spreadsheet applications interpret a cell that starts with `=`, `+`, `-`, `@`, `\t`, or `\r` as a formula. Because FacturaScripts only sanitises HTML metacharacters (` " '`) on save via `Tools::noHtml()` (`Core/Tools.php:45`), the formula prefix characters survive untouched all the way to the export. The downstream consumer is the admin who triggered the export, giving the attacker a reliable handoff: low-priv user plants a payload in any text field
03 / Response
What to do next
- vendor patch
The original advisory lists fixed boundaries 2026.2 for facturascripts/facturascripts. Confirm the publisher’s latest guidance.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database via OSV
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Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
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- GHSA-2p5x-4jr6-x5jg ↗
GitHub Advisory Database via OSV · vendor advisory
Observed . GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 2 ·
Source facts changed; compare the preserved prior revision.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.