Is CVE-2026-8410 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-8410 being exploited in the wild.

How severe is CVE-2026-8410?

Medium severity, with a CVSS score of 4, published 21 May 2026.

Which products and versions are affected?

Concrete CMS 9.0.0 to 9.4.8 (before 9.5.0), 9.0.0RC1 to 9.5.0; concrete5/concrete5 (Packagist) >= 9.0.0RC1, < 9.5.1, ECOSYSTEM:introduced=9.0.0RC1,fixed=9.5.1.

Is there a fix for CVE-2026-8410?

Yes. concrete5/concrete5 (Packagist): upgrade to 9.5.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-8410 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-8410?

Check whether you run Concrete CMS or concrete5/concrete5 (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-8410: Concrete CMS CSRF in bulk log deletion

Q: Is there a fix for CVE-2026-8410?

Yes. concrete5/concrete5 (Packagist): upgrade to 9.5.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-8410 attacked?

It is attacked over the network, in a network appliance.

Q: Am I affected by CVE-2026-8410?

Check whether you run Concrete CMS or concrete5/concrete5 (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-8410 · Severity: medium · CVSS 4 · Published 2026-05-21

Concrete CMS, a popular content management system, is vulnerable to a security flaw that could allow an attacker to trick an administrator into unintentionally deleting system logs. By persuading a logged-in user to click a malicious link or visit a compromised website, the attacker can trigger the bulk deletion of logs without the user's consent. This can hinder security auditing and incident response by removing records of system activity.

Technologies: Concrete CMS, concrete5/concrete5 (Packagist). Vendors: Concrete CMS, Packagist.

Quick answers

Is CVE-2026-8410 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-8410 being exploited in the wild.
How severe is CVE-2026-8410?: Medium severity, with a CVSS score of 4, published 21 May 2026.
Which products and versions are affected?: Concrete CMS 9.0.0 to 9.4.8 (before 9.5.0), 9.0.0RC1 to 9.5.0; concrete5/concrete5 (Packagist) >= 9.0.0RC1, < 9.5.1, ECOSYSTEM:introduced=9.0.0RC1,fixed=9.5.1.
Is there a fix for CVE-2026-8410?: Yes. concrete5/concrete5 (Packagist): upgrade to 9.5.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-8410 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-8410?: Check whether you run Concrete CMS or concrete5/concrete5 (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

concrete5/concrete5 (Packagist): upgrade to 9.5.1 or later
```
composer require concrete5/concrete5:^9.5.1
```

Technical details

A Cross-Site Request Forgery (CSRF) vulnerability exists in Concrete CMS within the 'concrete/controllers/dialog/logs/bulk/delete' controller. The application fails to properly validate CSRF tokens or implement sufficient SameSite cookie attributes for requests sent to this endpoint. An unauthenticated remote attacker can exploit this by inducing a logged-in administrator to submit a specially crafted web request, leading to the unauthorized bulk deletion of system logs. This issue is addressed in version 9.5.1.

Affected products

Concrete CMS Concrete CMS 9.0.0RC1 to 9.5.0

Identifiers

CVE-2026-8410
GHSA-v7c7-658v-hh7v

Timeline

2026-05-21: disclosed: NVD publication date
2026-05-22: advisory: GitHub Advisory published
2026-06-24: patched: Advisory updated with patch information for version 9.5.1

References

https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes

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