# CVE-2026-13707: Session fixation attacks on improperly configured OAuth 1.0a tools

> Attackers can hijack user sessions via fixation in improperly configured OAuth 1.0a tools, requiring configuration changes or patches.

- **Severity:** Not scored
- **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:** Yes
- **Published:** 1 Jul 2026
- **Updated:** 1 Jul 2026
- **Also known as:** GHSA-qjj7-573r-4398, MINI-643p-4735-rfgj, MINI-64vc-3jwj-64hh, MINI-x276-f8c3-cp38

## What is CVE-2026-13707?

CVE-2026-13707 is an authentication bypass vulnerability in Mediawiki Mediawiki, published on 1 Jul 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

Session fixation vulnerability in Wikimedia Foundation OAuth.

 This vulnerability is associated with program files src/Backend/MWOAuthServer.Php.

This issue affects OAuth: from * through 1.46.0, 1.45.4, 1.44.6, 1.43.9.

Weakness: CWE-384 (Session Fixation)

## Which versions are affected by CVE-2026-13707?

It affects 1 product.


Products: Mediawiki Mediawiki.

## How do I fix CVE-2026-13707?

Apply the vendor's patch.

## Is CVE-2026-13707 being exploited?

There is no known exploitation of CVE-2026-13707 in the wild and no public exploit code.

## Other vulnerabilities in Mediawiki Mediawiki

- [CVE-2023-37303](https://insights.sbomify.com/CVE-2023-37303/): Denial of service in n/a (critical 9.8)
- [CVE-2022-29904](https://insights.sbomify.com/CVE-2022-29904/): SQL injection in n/a (critical 9.8)
- [CVE-2022-29906](https://insights.sbomify.com/CVE-2022-29906/): Missing authorization in n/a (critical 9.8)
- [CVE-2022-28205](https://insights.sbomify.com/CVE-2022-28205/): Business logic in n/a (critical 9.8)
- [CVE-2022-28206](https://insights.sbomify.com/CVE-2022-28206/): Missing authorization in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-13707 and fix it if it is affected.

What it is: CVE-2026-13707 is an authentication bypass vulnerability in Mediawiki Mediawiki, published on 1 Jul 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-2026-13707 in the wild and no public exploit code.

Affected product: Mediawiki Mediawiki. 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-2026-13707/ (Markdown: https://insights.sbomify.com/CVE-2026-13707/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13707
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13707
- OSV: https://osv.dev/vulnerability/CVE-2026-13707

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-13707/
Summaries are generated and may contain mistakes; the official description above is the record.