Is CVE-2026-8245 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-8245 being exploited in the wild.

How severe is CVE-2026-8245?

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

Which products and versions are affected?

Concrete CMS <= 9.5.0, 9.5.0 and below; concrete5/concrete5 (Packagist) < 9.5.1, ECOSYSTEM:introduced=0,fixed=9.5.1.

Is there a fix for CVE-2026-8245?

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-2026-8245 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-8245?

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-2026-8245: Concrete CMS Reflected XSS in Legacy Pagination

Q: Which products and versions are affected?

Concrete CMS <= 9.5.0, 9.5.0 and below; concrete5/concrete5 (Packagist) < 9.5.1, ECOSYSTEM:introduced=0,fixed=9.5.1.

Q: Is there a fix for CVE-2026-8245?

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-2026-8245 attacked?

It is attacked over the network, in a web application.

Q: Am I affected by CVE-2026-8245?

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-2026-8245 · Severity: medium · CVSS 4 · Published 2026-05-21

Concrete CMS, a popular content management system, is vulnerable to a security flaw in its legacy pagination component. An attacker can create a malicious link that, if clicked by an administrator or report viewer, allows the attacker to execute unauthorized scripts in the victim's browser session. This could lead to the theft of sensitive session information or unauthorized actions being performed on the website.

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

Quick answers

Is CVE-2026-8245 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-8245 being exploited in the wild.
How severe is CVE-2026-8245?: Medium severity, with a CVSS score of 4, published 21 May 2026.
Which products and versions are affected?: Concrete CMS <= 9.5.0, 9.5.0 and below; concrete5/concrete5 (Packagist) < 9.5.1, ECOSYSTEM:introduced=0,fixed=9.5.1.
Is there a fix for CVE-2026-8245?: 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-2026-8245 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-8245?: 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 reflected cross-site scripting (XSS) vulnerability exists in Concrete CMS versions 9.5.0 and below within the Legacy Pagination component. The root cause is the raw interpolation of the $URL field into the href attribute of pagination links in Concrete\Core\Legacy\Pagination. An attacker can craft a malicious URL that injects HTML attributes/scripts. When an authenticated administrator or report viewer with access to the legacy reports dashboard (/dashboard/reports/forms/legacy) clicks this crafted link, the payload executes within their session context. This vulnerability is tracked as CVE-2026-8245 and is fixed in version 9.5.1.

Affected products

Concrete CMS Concrete CMS <= 9.5.0

Identifiers

CVE-2026-8245
GHSA-f73j-pm2c-rxvr

Timeline

2026-05-21: disclosed: NVD Published Date
2026-05-22: advisory: GitHub Advisory published
2026-05-22: patched: Version 9.5.1 released with fix

References

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

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