# CVE-2026-26477: Denial of service in DokuWiki

> A remote attacker can cause a denial of service in DokuWiki via the media upload function, requiring administrators to upgrade the software.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Apr 2026
- **Updated:** 8 Apr 2026
- **Also known as:** DEBIAN-CVE-2026-26477, GHSA-gwpq-c4hc-7qhj, UBUNTU-CVE-2026-26477

## What is CVE-2026-26477?

CVE-2026-26477 is a medium-severity denial of service vulnerability in DokuWiki, published on 3 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An issue in Dokuwiki v.2025-05-14b "Librarian" [56.2] allows a remote attacker to cause a denial of service via the media_upload_xhr() function in the media.php file

Weakness: CWE-400 (Uncontrolled Resource Consumption), CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2026-26477?

It affects 1 product.


Products: Dokuwiki Dokuwiki.

## How do I fix CVE-2026-26477?

Upgrade to a fixed version.

## Is CVE-2026-26477 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26477 exists.

## Other vulnerabilities in DokuWiki

- [CVE-2018-15474](https://insights.sbomify.com/CVE-2018-15474/): Code injection in n/a (critical 9.6)
- [CVE-2009-1960](https://insights.sbomify.com/CVE-2009-1960/): Code injection in n/a (critical 9.3)
- [CVE-2016-7964](https://insights.sbomify.com/CVE-2016-7964/): Server-side request forgery in n/a (high 8.6)
- [CVE-2010-0288](https://insights.sbomify.com/CVE-2010-0288/): Missing authorization in n/a (high 7.5)
- [CVE-2019-25338](https://insights.sbomify.com/CVE-2019-25338/): Dokuwiki 2018-04-22b - Username Enumeration (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-26477 and fix it if it is affected.

What it is: CVE-2026-26477 is a medium-severity denial of service vulnerability in DokuWiki, published on 3 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26477 exists.

Affected product: DokuWiki. 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-2026-26477/ (Markdown: https://insights.sbomify.com/CVE-2026-26477/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-26477
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-26477
- OSV: https://osv.dev/vulnerability/CVE-2026-26477

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-26477/
Summaries are generated and may contain mistakes; the official description above is the record.