# CVE-2026-48910: Apache JSPWiki: Markdown parser allows XSS injection in Markdown error processing

> Attackers can inject JavaScript via crafted Markdown editing requests in Apache JSPWiki, leading to XSS and potential data theft.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A: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:** 30 Jul 2026
- **Updated:** 30 Jul 2026
- **Also known as:** GHSA-g956-w8r6-2m72

## What is CVE-2026-48910?

CVE-2026-48910 is a medium-severity cross-site scripting vulnerability in Apache JSPWiki, published on 30 Jul 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

A carefully crafted editing request could trigger an XSS vulnerability 
on Apache JSPWiki when parsing errors on the markdown renderer, which 
could allow the attacker to execute javascript in the victim's browser 
and get some sensitive information about the victim.

This issue affects Apache JSPWiki: through 2.12.3.

Users are recommended to upgrade to version 2.12.4, which fixes the issue.

Weakness: CWE-80 (Improper Neutralization of Script-Related HTML Tags in a Web Page)

## Which versions are affected by CVE-2026-48910?

It affects 1 product.


Products: Apache Jspwiki.

## How do I fix CVE-2026-48910?

No fix has been published for CVE-2026-48910 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-48910 being exploited?

There is no known exploitation of CVE-2026-48910 in the wild and no public exploit code.

## Other vulnerabilities in Apache JSPWiki

- [CVE-2026-28812](https://insights.sbomify.com/CVE-2026-28812/): Apache JSPWiki: UserManager does not sanity-check user database at startup (critical 9.8)
- [CVE-2021-44140](https://insights.sbomify.com/CVE-2021-44140/): Arbitrary file deletion on logout (critical 9.1)
- [CVE-2026-28813](https://insights.sbomify.com/CVE-2026-28813/): Apache JSPWiki: JSPWiki vulnerable to JSON hijacking (high 8.8)
- [CVE-2022-34158](https://insights.sbomify.com/CVE-2022-34158/): User Group Privilege Escalation (high 8.8)
- [CVE-2022-24947](https://insights.sbomify.com/CVE-2022-24947/): Apache JSPWiki CSRF Account Takeover (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-48910 and fix it if it is affected.

What it is: CVE-2026-48910 is a medium-severity cross-site scripting vulnerability in Apache JSPWiki, published on 30 Jul 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-2026-48910 in the wild and no public exploit code.

Affected product: Apache JSPWiki. 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-2026-48910/ (Markdown: https://insights.sbomify.com/CVE-2026-48910/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-48910
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-48910
- OSV: https://osv.dev/vulnerability/CVE-2026-48910

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-48910/
Summaries are generated and may contain mistakes; the official description above is the record.