# CVE-2026-48849: Cross-site scripting in Webmail

> Attackers can inject malicious scripts via unsanitized subject fields in restored drafts, affecting shared mailboxes in Roundcube Webmail.

- **Severity:** Medium 4.4 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A: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:** Yes
- **Published:** 25 May 2026
- **Updated:** 26 May 2026
- **Also known as:** DEBIAN-CVE-2026-48849, GHSA-2m7q-4j9m-89vh, UBUNTU-CVE-2026-48849

## What is CVE-2026-48849?

CVE-2026-48849 is a medium-severity cross-site scripting vulnerability in Roundcube Webmail, published on 25 May 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

In Roundcube Webmail 1.6.x before 1.6.16 and 1.7.x before 1.7.1, an unsanitized subject field in the draft restored value could lead to stored XSS/HTML/CSS injection on shared mailboxes.

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

## Which versions are affected by CVE-2026-48849?


## How do I fix CVE-2026-48849?

Upgrade to a fixed version.

## Is CVE-2026-48849 being exploited?

There is no known exploitation of CVE-2026-48849 in the wild and no public exploit code.

Public exploit code:

- This repository documents CVE-2026-48849, a Stored Cross-Site Scripting (XSS), HTML Injection, and CSS Injection vulnerability discovered in Roundcube Webmai (github_poc): https://github.com/AnandJogawade/CVE-2026-48849-Roundcube-Webmail-Stored-XSS

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-48849 and fix it if it is affected.

What it is: CVE-2026-48849 is a medium-severity cross-site scripting vulnerability in Roundcube Webmail, published on 25 May 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-2026-48849 in the wild and no public exploit code.

Affected product: Roundcube Webmail. 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-2026-48849/ (Markdown: https://insights.sbomify.com/CVE-2026-48849/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-48849
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-48849
- OSV: https://osv.dev/vulnerability/CVE-2026-48849

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-48849/
Summaries are generated and may contain mistakes; the official description above is the record.