# CVE-2026-85601: Grav Admin before 2.0.20 Cross-Site Scripting via marked.js

> Attackers can execute arbitrary JavaScript in authenticated admin sessions by injecting malicious URIs into plugin or theme changelogs via unsanitized Markdown rendering.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 4 Sep 2026
- **Updated:** 10 Sep 2026
- **Also known as:** GHSA-752r-88j4-vxm3, GHSA-pqmm-93p6-x64h

## What is CVE-2026-85601?

CVE-2026-85601 is a medium-severity cross-site scripting vulnerability in getgrav grav, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Grav Admin before 2.0.20 fails to sanitize output from marked.parse() before injecting it into the DOM via Svelte's {@html} directive in MarkdownEditor and MarkdownModal components. Attackers can inject javascript: URI schemes in plugin or theme changelogs to execute arbitrary code in authenticated admin sessions without requiring site access.

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

## Which versions are affected by CVE-2026-85601?


## How do I fix CVE-2026-85601?

No fix has been published for CVE-2026-85601 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-85601 being exploited?

There is no known exploitation of CVE-2026-85601 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-85601 and fix it if it is affected.

What it is: CVE-2026-85601 is a medium-severity cross-site scripting vulnerability in getgrav grav, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-85601 in the wild and no public exploit code.

Affected product: getgrav grav. 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-2026-85601/ (Markdown: https://insights.sbomify.com/CVE-2026-85601/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-85601
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-85601
- OSV: https://osv.dev/vulnerability/CVE-2026-85601

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-85601/
Summaries are generated and may contain mistakes; the official description above is the record.