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HIGH severity

CVE-2021-41824 — cms

HIGHFix: craftcms/cms@c9cb222

CVE-2021-41824 is a high-severity (CVSS 8.8) CWE-1236 vulnerability in craftcms/cms. A fix is available for craftcms/cms — see the affected versions and patch details below.

CSV Injection Vulnerability

Also known asGHSA-h7vq-5qgw-jwwq
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs71th percentile — riskier than 71% of all scored CVEsHighest risk
0.01%0.63%1.25%1.87%0.5%1.4%Apr 26Sep 26Oct 26

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

How urgent is this, really

CVE-2021-41824 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐘craftcms/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

In some circumstances, it was possible to export data in CSV format that could trigger a payload in old versions of Excel.

If you are accepting user input from untrusted sources and will be exporting that data in CSV format from element index pages and there is a chance users will open that on old versions of Excel, then you should update.

Patches

This has been patched in Craft 3.7.14.

References

For more information

If you have any questions or comments about this advisory, email us at [email protected]

Credits: BAE Systems AI Vulnerability Research Team – Azrul Ikhwan Zulkifli

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistcraftcms/cms≥ 3.4.0&&< 3.7.143.7.14composer require craftcms/cms:^3.7.14

Affected Products

1 product · 1 configurations
Application
craft cmscraftcms
≥ 3.4.0 && < 3.7.14
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update craftcms/cms to 3.7.14 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-41824 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Impact In some circumstances, it was possible to export data in CSV format that could trigger a payload in old versions of Excel. If you are accepting user input from untrusted sources and will be exporting that data in CSV format from element index pages and there is a chance users will open that on old versions of Excel, then you should update. ### Patches This has been patched in Craft 3.7.14. ### References * https://github.com/craftcms/cms/blob/develop/CHANGELOG.md#3714---2021-09-28 * https://twitter.com/craftcmsupdates/status/1442928690145366018 ### For more information If you h
O3 Security · Impact-Aware SCA

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CVE-2021-41824: cms — Fixed in 3.7.14