# CVE-2026-68534: Concrete CMS below 9.5.2 is vulnerable to Stored XSS via unescaped Express entry labels in association selectors

> An unauthenticated attacker can inject malicious scripts via Express entry labels, leading to code execution in administrator or visitor sessions.

- **Severity:** Low 2.3 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 Sep 2026
- **Updated:** 15 Sep 2026
- **Also known as:** GHSA-qh33-6hmp-jg6p

## What is CVE-2026-68534?

CVE-2026-68534 is a low-severity cross-site scripting vulnerability in Concrete CMS, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Concrete CMS before 9.5.3 rendered Express entry labels as raw HTML when displaying associated entries, resulting in stored cross-site scripting. An unauthenticated attacker could submit a payload through a public Express Form; it then executed in an administrator's dashboard session when the associated entry was viewed, or in the browser of any visitor to a page using an Express Entry List block with association columns, allowing actions to be performed with that user's privileges. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks v01demort for reporting.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-68534?


## How do I fix CVE-2026-68534?

No fix has been published for CVE-2026-68534 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-68534 being exploited?

There is no known exploitation of CVE-2026-68534 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-68534 and fix it if it is affected.

What it is: CVE-2026-68534 is a low-severity cross-site scripting vulnerability in Concrete CMS, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-68534 in the wild and no public exploit code.

Affected product: Concrete CMS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-68534/ (Markdown: https://insights.sbomify.com/CVE-2026-68534/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-68534
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-68534
- OSV: https://osv.dev/vulnerability/CVE-2026-68534

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-68534/
Summaries are generated and may contain mistakes; the official description above is the record.