# CVE-2026-76798: MongoSQL Transition Readiness Tool Improper Output Encoding in Generated HTML Reports

> Attackers can inject scripts into HTML reports via BI Connector logs, potentially disclosing sensitive data or misleading operators when reports are viewed.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA: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:** 28 Aug 2026
- **Updated:** 31 Aug 2026
- **Also known as:** GHSA-5phg-fmwx-665v

## What is CVE-2026-76798?

CVE-2026-76798 is a medium-severity cross-site scripting vulnerability in MongoDB BI Connector Transition Readiness Report, published on 28 Aug 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

The MongoSQL Transition Readiness Tool writes query text and user names read from BI Connector log files into its generated HTML report without encoding them for that output context. A user able to issue queries through the BI Connector can influence log content so that markup supplied in a query is interpreted by the browser when an operator later generates and opens the report, which may disclose other users' logged query text and user names to an external party or present misleading content to the operator. Generating a report over logs containing the affected entries and opening that report in a browser is required.

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

## Which versions are affected by CVE-2026-76798?

It affects 1 product.


Products: Mongodb Mongosql Transition Readiness Tool.

## How do I fix CVE-2026-76798?

No fix has been published for CVE-2026-76798 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-76798 being exploited?

There is no known exploitation of CVE-2026-76798 in the wild and no public exploit code.

## Other vulnerabilities in MongoDB BI Connector Transition Readiness Report

- [CVE-2026-76797](https://insights.sbomify.com/CVE-2026-76797/): MongoSQL Transition Readiness Tool Improper Neutralization of Formula Elements in Generated Reports (medium 5.8)
- [CVE-2026-76794](https://insights.sbomify.com/CVE-2026-76794/): MongoDB BI Connector Transition Readiness Report Improper HTML Encoding When Processing Database Metadata (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-76798 and fix it if it is affected.

What it is: CVE-2026-76798 is a medium-severity cross-site scripting vulnerability in MongoDB BI Connector Transition Readiness Report, published on 28 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-76798 in the wild and no public exploit code.

Affected product: MongoDB BI Connector Transition Readiness Report. 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-2026-76798/ (Markdown: https://insights.sbomify.com/CVE-2026-76798/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-76798
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-76798
- OSV: https://osv.dev/vulnerability/CVE-2026-76798

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-76798/
Summaries are generated and may contain mistakes; the official description above is the record.