# CVE-2026-56094: Information Disclosure in extension "Apache Solr for TYPO3 - Enterprise Search" (solr)

> Attackers can read public documents from other sites in a shared Solr core by manipulating the additionalFilters parameter.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/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:** Not needed
- **Fix available:** No
- **Published:** 25 Aug 2026
- **Updated:** 17 Sep 2026
- **Also known as:** GHSA-9xwm-q597-w98q

## What is CVE-2026-56094?

CVE-2026-56094 is a medium-severity vulnerability in Extension "Apache Solr for TYPO3 - Enterprise Search", published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The extension allows a request-provided additionalFilters parameter to register a named siteHash filter before the system's own siteHash filter is applied, and the query builder does not overwrite an already-registered named filter. In a shared Solr core serving multiple TYPO3 sites, a visitor can use this to read public documents belonging to another site. The same root cause also affects the suggest top-results path when suggest is enabled.

Weakness: CWE-943 (Improper Neutralization of Special Elements in Data Query Logic)

## Which versions are affected by CVE-2026-56094?


## How do I fix CVE-2026-56094?

No fix has been published for CVE-2026-56094 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-56094 being exploited?

There is no known exploitation of CVE-2026-56094 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-56094 and fix it if it is affected.

What it is: CVE-2026-56094 is a medium-severity vulnerability in Extension "Apache Solr for TYPO3 - Enterprise Search", published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-56094 in the wild and no public exploit code.

Affected product: Extension "Apache Solr for TYPO3 - Enterprise Search". 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-2026-56094/ (Markdown: https://insights.sbomify.com/CVE-2026-56094/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-56094
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-56094
- OSV: https://osv.dev/vulnerability/CVE-2026-56094

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-56094/
Summaries are generated and may contain mistakes; the official description above is the record.