# CVE-2026-30048: NotChatbot WebChat has a stored cross-site scripting (XSS) vulnerability

> Attackers can inject arbitrary JavaScript into chat history via unsanitized input, leading to code execution when history is reloaded.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 18 Mar 2026
- **Updated:** 19 Mar 2026
- **Also known as:** GHSA-w3vx-52j6-9fjp

## What is CVE-2026-30048?

CVE-2026-30048 is a medium-severity cross-site scripting vulnerability in n/a, published on 18 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

A stored cross-site scripting (XSS) vulnerability exists in the NotChatbot WebChat widget thru 1.4.4. User-supplied input is not properly sanitized before being stored and rendered in the chat conversation history. This allows an attacker to inject arbitrary JavaScript code which is executed when the chat history is reloaded. The issue is reproducible across multiple independent implementations of the widget, indicating that the vulnerability resides in the product itself rather than in a specific website configuration.

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

## Which versions are affected by CVE-2026-30048?

2 open source packages ship an affected version, including @developer.notchatbot/webchat.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@developer.notchatbot/webchat` | npm | All versions to 1.5.0 | None |
| `@developer.notchatbot/webchat` | npm | All versions to 1.5.0 | None |

## How do I fix CVE-2026-30048?

No fix has been published for CVE-2026-30048 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-30048 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-30048 exists.

Public exploit code:

- Stored XSS in NotChatbot WebChat <= 1.5.0 (CVE-2026-30048) (github_poc): https://github.com/0xN4no/CVE-2026-30048

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-30048 and fix it if it is affected.

What it is: CVE-2026-30048 is a medium-severity cross-site scripting vulnerability in n/a, published on 18 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-30048 exists.

Affected packages and fixed versions:
- @developer.notchatbot/webchat (npm): affected all versions up to 1.5.0; no fix listed
- @developer.notchatbot/webchat (npm): affected all versions up to 1.5.0; no fix listed

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-2026-30048/ (Markdown: https://insights.sbomify.com/CVE-2026-30048/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-30048
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-30048
- OSV: https://osv.dev/vulnerability/CVE-2026-30048

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-30048/
Summaries are generated and may contain mistakes; the official description above is the record.