statamic/cms security advisory

CVE-2026-54243: Statamic Vulnerable to CSV formula injection in form submission exports

CVE-2026-54243 is a medium-severity CSV injection vulnerability in the PHP package statamic/cms (CVSS 6.1), published 17 July 2026. It is fixed in 5.73.24 and 6.20.1, one per release line; earlier versions on each line are affected. It can be exploited without an account.

medium 6.1 published 2026-07-17 · updated 2026-10-24

Affected versions: < 5.73.24
>= 6.0.0, < 6.20.1
Fixed in: 5.73.24, 6.20.1
Newest release: 6.40.0
Severity: Medium · CVSS 6.1
Type: CSV injection
CWE-1236
Exploited in the wild: Not on the CISA KEV list
checked 2026-11-04

Is your statamic/cms version affected?

Run composer show statamic/cms in your project, then enter the version. We check it against this and every other known statamic/cms advisory.

Who can exploit CVE-2026-54243

Access: No account. Anyone who can send a request to an app that uses the affected code.
Interaction: A user also has to do something, such as open a link or a page the attacker prepared.

CVSS vector (scored by GitHub): CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Your app is only exposed if it uses the affected part of statamic/cms. The advisory below says which part that is. If you are not sure, upgrade anyway: it costs less than finding out.

How to fix CVE-2026-54243 in statamic/cms

Find the installed version: composer show statamic/cms. If you never required it yourself, composer why statamic/cms shows which package pulls it in.
Update it: composer update statamic/cms --with-all-dependencies. You need the fixed version for your release line (5.73.24 and 6.20.1).
If Composer will not go that high, your composer.json constraint is holding it back. Widen it (for example "statamic/cms": "^6.20.1" if you can take that version), or upgrade the package that requires it.
Run composer audit. It reads the same advisory data and should no longer list CVE-2026-54243.
Commit composer.lock and deploy it. On the server, run composer install --no-dev from the lock file, not composer update.

If you cannot upgrade yet

General hardening for CSV injection issues while the upgrade waits. None of it replaces the fix.

If your app does not use the affected feature, note that in your audit, but still plan the upgrade.

The CVE-2026-54243 advisory

Statamic is a Laravel and Git powered content management system (CMS). Prior to 5.73.24 and 6.20.1, form submission values in src/Forms/Exporters/CsvExporter.php were not neutralized for spreadsheet formula characters when exported to CSV. A submission containing a value beginning with a formula trigger character, such as =, +, -, or @, could be interpreted as a live formula when a Control Panel user opens the export in a spreadsheet application. Form submissions can come from unauthenticated front-end visitors, so the malicious value can be supplied by an anonymous user and is later triggered by an editor opening the export. This issue is fixed in versions 5.73.24 and 6.20.1.

Description from the CVE record, published by GitHub (the CVE Numbering Authority), via the NVD entry for CVE-2026-54243. Advisory title: “Statamic Vulnerable to CSV formula injection in form submission exports”.

References

GitHub advisory GHSA-h77m-qrj7-jxcw github.com
Fix commit f17c098 github.com
Pull request #14760 github.com
Release v5.73.24 github.com
Release v6.20.1 github.com

Other statamic/cms advisories

medium CVE-2026-71435: Statamic: Stored Cross-Site Scripting in Automagic Form Notification Email Template 2026-08-06
medium CVE-2026-71434: Statamic: Missing file upload validation on frontend forms allows uploading disallowed file types 2026-08-06
medium CVE-2026-64662: Statamic: Missing authorization on navigation endpoint allows disclosure of restricted entries 2026-08-06
medium CVE-2026-64663: Statamic: Unsafe method invocation via Antlers template resolution allows data destruction 2026-08-06
high CVE-2026-64665: Statamic: Account takeover via OAuth email matching without email-verification check 2026-08-06
medium CVE-2026-64664: Statamic: Missing authorization on Control Panel endpoint allows disclosure of user existence 2026-08-06

Need help patching or upgrading? Laskyr does PHP and Laravel security fixes and upgrades. Tell us what you run and we reply with a plan and a price.

Ask about a fix

Where this data comes from

Affected and fixed versions: the Packagist security advisories API (GitHub Advisory Database and FriendsOfPHP), the same data composer audit uses. Synced 2026-11-03.
Description, score, weakness and references: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
Exploited-in-the-wild status: the CISA Known Exploited Vulnerabilities catalog, checked 2026-11-04.
Compiled by Daniel Lasek at Laskyr from the sources above. The summary, “who can exploit it”, “how to fix it” and hardening sections are our plain-English reading of the record and are generated from it. The quoted description is the record's own text. Spot an error? Tell us.