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CVE-2018-9846: In Roundcube from versions 1.2.0 to 1.3.5, with the archive plugin enabled and configured, it's possible to...

In Roundcube from versions 1.2.0 to 1.3.5, with the archive plugin enabled and configured, it's possible to exploit the unsanitized, user-controlled "_uid" parameter (in an archive.php _task=mail&_mbox=INBOX&_action=plugin.move2archive request) to perform an MX (IMAP) injection attack by placing an IMAP command after a %0d%0a sequence. NOTE: this is less easily exploitable in 1.3.4 and later because of a Same Origin Policy protection mechanism.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This vulnerability affects older Roundcube webmail installations when the archive plugin is enabled. A maliciously crafted archive action could inject commands into the backend IMAP interaction. Business urgency depends on whether vulnerable Roundcube versions and the archive plugin are still present.

Executive priority

Treat this as a targeted hygiene issue for legacy webmail. Prioritize remediation if Roundcube is internet-facing, handles sensitive mail, or still runs affected versions with the archive plugin enabled.

Technical view

Roundcube 1.2.0 through 1.3.5 are affected when the archive plugin is enabled and configured. The issue is unsanitized user-controlled input in the archive mail action, allowing IMAP command injection. Sources note exploitation is less easy in 1.3.4 and later because of Same Origin Policy protection.

Likely exposure

Exposure is limited to Roundcube deployments in the affected version range with the archive plugin enabled and configured. The provided affected CPE data is not specific, so asset validation should rely on deployed Roundcube version and plugin configuration rather than inventory matching alone.

Exploitation context

The source bundle does not show CISA KEV listing or confirmed active exploitation. Public references include Roundcube GitHub issues, a Debian advisory, and a write-up. The attacker prerequisites are not fully detailed in the bundle, so assume exposure is conditional until verified locally.

Researcher notes

The bundle lacks CVSS, CWE, precise fixed upstream version, and exploit prevalence. Validate directly against Roundcube version and plugin state. Avoid assuming all Roundcube deployments are affected; the archive plugin condition is central.

Mitigation direction

  • Identify and retire Roundcube 1.2.0 through 1.3.5 installations.
  • Disable the archive plugin where it is not required.
  • Apply vendor or distribution security updates, including relevant Debian guidance.
  • Review Roundcube upstream issue guidance before changing production behavior.

Validation and detection

  • Confirm the deployed Roundcube version on all webmail hosts.
  • Check whether the archive plugin is enabled and configured.
  • Review package manager history for Debian security update DSA-4181.
  • Inspect webmail access logs for unusual archive plugin activity.
  • Confirm any compensating Same Origin Policy protections in 1.3.4 or later.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

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