How severe is GHSA-r89v-cgv7-3jhx?

GHSA-r89v-cgv7-3jhx has a CVSS score of 5.2/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by GHSA-r89v-cgv7-3jhx?

GHSA-r89v-cgv7-3jhx affects the following packages: october/cms (Packagist). Ecosystems affected: Packagist.

How do I fix GHSA-r89v-cgv7-3jhx?

Update october/cms to 1.0.470 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-r89v-cgv7-3jhx is resolved across your whole dependency graph.

How do I detect GHSA-r89v-cgv7-3jhx in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for october/cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-r89v-cgv7-3jhx if there is no patch (or I can't update yet)?

Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Is GHSA-r89v-cgv7-3jhx actively exploited in the wild?

No public exploit code has been indexed for GHSA-r89v-cgv7-3jhx yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-r89v-cgv7-3jhx?

GHSA-r89v-cgv7-3jhx has an EPSS (Exploit Prediction Scoring System) score of 0.3%, placing it in the 22th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-r89v-cgv7-3jhx?

GHSA-r89v-cgv7-3jhx is classified as CWE-862 (CWE-862). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-r89v-cgv7-3jhx published, and has it been updated?

GHSA-r89v-cgv7-3jhx was published on November 23, 2020 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

MEDIUM severity

Bypass of fix for CVE-2020-15247, Twig sandbox escapeGHSA-r89v-cgv7-3jhx

MEDIUMFix: octobercms/october@d34fb8a

GHSA-r89v-cgv7-3jhx is a medium-severity (CVSS 5.2) CWE-862 vulnerability in october/cms. A fix is available for october/cms — see the affected versions and patch details below.

Also known asCVE-2020-26231

Published

Nov 23, 2020

Updated

Sep 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.3%probability of exploitation in next 30 days

Lower Risk+0.00%

Lower risk than most CVEs22th percentile — riskier than 22% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐘october/cms

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Impact

A bypass of CVE-2020-15247 (fixed in 1.0.469 and 1.1.0) was discovered that has the same impact as CVE-2020-15247:

An authenticated backend user with the cms.manage_pages, cms.manage_layouts, or cms.manage_partials permissions who would normally not be permitted to provide PHP code to be executed by the CMS due to cms.enableSafeMode being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP.

This is not a problem for anyone that trusts their users with those permissions to normally write & manage PHP within the CMS by not having cms.enableSafeMode enabled, but would be a problem for anyone relying on cms.enableSafeMode to ensure that users with those permissions in production do not have access to write & execute arbitrary PHP.

Patches

Issue has been patched in Build 470 (v1.0.470) and v1.1.1.

Workarounds

Apply https://github.com/octobercms/october/commit/d34fb8ab51108495a9a651b841202d935f4e12f7 to your installation manually if unable to upgrade to Build 470 or v1.1.1.

References

Reported by ka1n4t

For more information

If you have any questions or comments about this advisory:

Email us at [email protected]

Threat assessment:

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`october/cms`	≥ 1.0.469&&< 1.0.470	1.0.470`composer require october/cms:^1.0.470`

Affected Products

1 product · 2 configurations

Application

octoberoctobercms

2 versions

1.0.4691.1.0

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for october/cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update october/cms to 1.0.470 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-r89v-cgv7-3jhx is resolved across your whole dependency graph.
Workarounds
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

### Impact A bypass of CVE-2020-15247 (fixed in 1.0.469 and 1.1.0) was discovered that has the same impact as CVE-2020-15247: An authenticated backend user with the `cms.manage_pages`, `cms.manage_layouts`, or `cms.manage_partials` permissions who would **normally** not be permitted to provide PHP code to be executed by the CMS due to `cms.enableSafeMode` being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP. This is not a problem for anyone that trusts their users with those permissions to normally write & manage PHP within the CMS by not hav

O3 Security · Impact-Aware SCA

Is GHSA-r89v-cgv7-3jhx in your dependencies?

Find it across Packagist, including transitive dependencies.

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CVSS Score

5.2/10CVSS v3 base

Vector breakdown

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

Low

Raw vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

CWE Classification

CWE-862CWE-862

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

OpenSSF Scorecard

Package health score

october

4.6/10

Maintained10/10

Code-Review1/10

Branch-Protection0/10

Assessed Nov 9, 2026

Timeline

Disclosed

Nov 23, 2020

Last updated

Sep 10, 2026

Identifiers

GHSA-r89v-cgv7-3jhx

References

Advisorynvd.nist.gov · CVE 2020 26231 Advisorygithub.com · GHSA 94vp rmqv 5875 Webgithub.com · GHSA r89v cgv7 3jhx Webgithub.com · d34fb8ab51108495a9a651b841202d935f4e12f7

Related vulnerabilities

This CVE is medium severity; 6 of 8 other CVEs affecting october/cms are rated as high or higher (top: high).

CVE-2017-1000119CVE-2021-21264CVE-2020-15247CVE-2020-26231CVE-2020-15246CVE-2020-5297CVE-2020-5296CVE-2020-5295

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedSep 10, 2026