CVE-2021-29487

Name: CVE-2021-29487
Creator: NVD / NIST
Published: 2021-08-26T19:15:07.16+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.4/10EPSS 0.90%

Last modified Jun 17, 2026

CVE-2021-29487 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. 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. EPSS estimates a 0.90% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.4/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

0.90%

54.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Octobercms	October	>= 1.0.471, < 1.0.472
Octobercms	October	>= 1.1.1, < 1.1.5

References

https://github.com/octobercms/library/commit/016a297b1bec55d2e53bc889458ed2cb5c3e9374Patch, Third Party Advisory
https://github.com/octobercms/library/commit/5bd1a28140b825baebe6becd4f7562299d3de3b9Patch, Third Party Advisory
https://github.com/octobercms/october/security/advisories/GHSA-h76r-vgf3-j6w5Patch, Third Party Advisory
https://github.com/octobercms/library/commit/016a297b1bec55d2e53bc889458ed2cb5c3e9374Patch, Third Party Advisory
https://github.com/octobercms/library/commit/5bd1a28140b825baebe6becd4f7562299d3de3b9Patch, Third Party Advisory
https://github.com/octobercms/october/security/advisories/GHSA-h76r-vgf3-j6w5Patch, Third Party Advisory

Timeline

Published: Aug 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-29487?

How severe is CVE-2021-29487?

CVE-2021-29487 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 0.90% probability of exploitation in the next 30 days.

How do I fix CVE-2021-29487?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-29487?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST