# CVE-2026-101935: Echo Knowledge Base <= 17.214.0 - Reflected Cross-Site Scripting via 'new_kb_config' Parameter


- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 28 Oct 2026
- **Updated:** 29 Oct 2026
- **Also known as:** GHSA-7f9m-hhf7-j63p

## What is CVE-2026-101935?

CVE-2026-101935 is a medium-severity vulnerability in echoplugins Echo Knowledge Base – Documentation, FAQs, Chat & Smart Search, published on 28 Oct 2026. 

### Official description

The Echo Knowledge Base – Documentation, FAQs, Chat & Smart Search plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'new_kb_config' parameter (specifically the article-mobile-break-point-v2 key, among other config keys interpolated into the <style> element) in versions up to, and including, 17.214.0 This is due to insufficient input sanitization and output escaping in EPKB_Frontend_Editor::fe_preview_config() and EPKB_Articles_Setup: on every knowledge base article page view, when the request supplies epkb_fe_reload_mode=on, an attacker-controlled JSON blob is merged over the stored KB configuration and several values are concatenated directly into a stylesheet emitted inside a literal <style> element without escaping (minify_css() does not strip <, > or /). This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user (with Editor-level access or above, holding the manage_categories capability, or an Administrator) into performing an action such as clicking on a specially crafted link.

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

## Which versions are affected by CVE-2026-101935?


## How do I fix CVE-2026-101935?

No fix has been published for CVE-2026-101935 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-101935 being exploited?

There is no known exploitation of CVE-2026-101935 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-101935 and fix it if it is affected.

What it is: CVE-2026-101935 is a medium-severity vulnerability in echoplugins Echo Knowledge Base – Documentation, FAQs, Chat & Smart Search, published on 28 Oct 2026. 
Exploitation: There is no known exploitation of CVE-2026-101935 in the wild and no public exploit code.

Affected product: echoplugins Echo Knowledge Base – Documentation, FAQs, Chat & Smart 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-2026-101935/ (Markdown: https://insights.sbomify.com/CVE-2026-101935/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-101935
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-101935
- OSV: https://osv.dev/vulnerability/CVE-2026-101935

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-101935/
Summaries are generated and may contain mistakes; the official description above is the record.