Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2026-48842

Webmail SQL Injection

Roundcube / Webmail · affected before 1.6.16

View live feed Monitor via API Watch CVE-2026-48842
Severity
CVSS 8.1 · High
Confidence
High
Exploit status
Exploited in the wild
EPSS
0.9%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-48842 is an unauthenticated vulnerability affecting Roundcube Webmail. Roundcube Webmail 1.6.x before 1.6.16 and 1.7.x before 1.7.1 has Pre-authentication SQL injection in the virtuser_query plugin via a...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is high. Also confirmed by third-party sources.

Who is affected?

Roundcube / Webmail affected before 1.6.16.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Webmail SQL Injection

Roundcube Webmail 1.6.x before 1.6.16 and 1.7.x before 1.7.1 has Pre-authentication SQL injection in the virtuser_query plugin via a preg_replace() backslash escape bypass.

Roundcube Affected
Webmail
Before 1.6.16 Before 1.7.1
Published
25 May 2026
Exploitation Reported
24 Sep 2026
Attack vector
Remote
Complexity
High
Privileges
None
User interaction
None

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

Canadian Centre for Cyber Security

Recorded 24 Sep 2026

A trusted third party reported exploitation.

Proof of concept available

GitHub

Recorded 25 Sep 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
Canadian Centre for Cyber Security First 2026-09-24 09:23 UTC
TheHackerNews 2026-09-25 10:21 UTC
The Hacker News 2026-09-25 10:31 UTC
SOCRadar 2026-09-25 14:20 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.9%

Weaknesses

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') CWE-89

Recent mention · TheHackerNews

Roundcube Pre-Auth SQL Injection Flaw Actively Exploited in the Wild

The Canadian Centre for Cyber Security has warned that a now-patched Roundcube Webmail vulnerability is being actively exploited in the wild. The vulnerability in question is CVE-2026-48842 (CVSS score: 8.1), a pre-authentication SQL injection in the virtuser_query plugin of...

Read full advisory

All Mentions

Recent mention · TheHackerNews

Roundcube Pre-Auth SQL Injection Flaw Actively Exploited in the Wild

TheHackerNews · 25 Sep 2026

The Canadian Centre for Cyber Security has warned that a now-patched Roundcube Webmail vulnerability is being actively exploited in the wild. The vulnerability in question is CVE-2026-48842 (CVSS score: 8.1), a pre-authentication SQL injection in the virtuser_query plugin of Roundcube Webmail versions 1.6.x before 1.6.16 and 1.7.x before 1.7.1. The issue stems from a preg_replace() backslash

Recent mention · SOCRadar

Roundcube SQLi (CVE-2026-48842) Exploited

SOCRadar · 25 Sep 2026

Roundcube SQLi (CVE-2026-48842) Exploited A pre-authentication SQL injection vulnerability in Roundcube Webmail is reportedly being exploited in the wild months after patches became available. Tracked as CVE-2026-48842 ,

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

murrez/CVE-2026-48842

github · Created 2026-09-25 05:59:39 UTC · 0 stars · AI assessment 90%

Roundcube virtuser_query pre-auth SQLi (CVE-2026-48842). Python PoC — version detect, virtuser plugin, login probe. https://pocbit.org

Timeline

From disclosure to observed exploitation

  1. 14:20 UTC

    KEV confirmed by SOCRadar

    Exploitation attested by an external source

  2. 10:31 UTC

    KEV confirmed by The Hacker News

    Exploitation attested by an external source

  3. 10:21 UTC

    KEV confirmed by TheHackerNews

    Exploitation attested by an external source

  4. 05:59 UTC

    Public PoC available

    Public proof-of-concept code published

  5. 09:23 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  6. 19:06 UTC

    CVE published

    Vulnerability disclosed publicly

  7. 19:06 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-48842

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-48842",
  "confidence": "High",
  "cvss_score": 8.1,
  "cvss_estimated": false,
  "epss_score": 0.00888,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}