Vulnerability report

Active exploitation observed Confirmed confidence Not in CISA KEV

CVE-2026-48842

Webmail SQL Injection

Roundcube / Webmail · affected before 1.6.16

Watch CVE-2026-48842 Browse KEV feed
Severity
CVSS 8.1 · High
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
0.9%
First observed
29 Sep 2026
Last observed
29 Sep 2026

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 sensors observed exploitation attempts with confirmed confidence. Also confirmed by third-party sources.

Who is affected?

Roundcube / Webmail affected before 1.6.16.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

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.

Active exploitation observed

Previdian sensor

First observed 29 Sep 2026

Previdian first observed exploitation attempts targeting this vulnerability in our honeypot sensors.

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.

Learn about Pro API access
Source Added
Canadian Centre for Cyber Security First 2026-09-24 09:23 UTC
The Hacker News 2026-09-25 10:21 UTC
SOCRadar 2026-09-25 14:20 UTC
Security Affairs 2026-09-28 07:21 UTC
Previdian Sensors 2026-09-29 14:12 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Previdian sensors recorded exploitation attempts targeting this vulnerability. The cards and chart show volume, unique attackers, and daily activity.

4

Attempts observed

1

Unique attacker IPs

1

Attacker countries

ZA

1

Sensors observed

CVE-2026-48842 exploitation attempts over the last 13 days

Daily events observed by Previdian sensors

Updated 10 Oct 2026

0
4
0
0
0
0
0
0
0
0
0
0
0
28 Sep 1 Oct 4 Oct 7 Oct 10 Oct

First observed 29 Sep 2026 · Last observed 29 Sep 2026

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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
1
1
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 →

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

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Risk and context

Severity, weaknesses, and research context

CVSS v3.1

8.1 High

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

0.9%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

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

Recent mention · Security Affairs

Roundcube SQL injection CVE-2026-48842 is now being exploited in the wild

Roundcube SQL injection CVE-2026-48842 is now being exploited in the wild, putting unpatched webmail servers at risk of database compromise. A Roundcube Webmail vulnerability, tracked as CVE-2026-48842 (CVSS score of 8.1) and patched four months ago, is now being exploited in...

Read full advisory

All Mentions

Recent mention · Security Affairs

Roundcube SQL injection CVE-2026-48842 is now being exploited in the wild

Security Affairs · 28 Sep 2026

Roundcube SQL injection CVE-2026-48842 is now being exploited in the wild, putting unpatched webmail servers at risk of database compromise. A Roundcube Webmail vulnerability, tracked as CVE-2026-48842 (CVSS score of 8.1) and patched four months ago, is now being exploited in the wild. The Canadian Centre for Cyber Security added the warning to its advisory […]

Recent mention · The Hacker News

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

The Hacker News · 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.

4minx/CVE-2026-48842

github · Created 2026-09-27 11:26:19 UTC · 0 stars · AI assessment 90%

CVE-2026-48842 PoC — Roundcube virtuser_query pre-auth SQLi

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. 14:09 UTC

    Indicator of compromise added

    Indicators of compromise recorded

  2. 14:09 UTC

    Observed by Previdian sensors

    Evidence-backed exploitation signal

  3. 07:21 UTC

    KEV confirmed by Security Affairs

    Exploitation attested by an external source

  4. 14:20 UTC

    KEV confirmed by SOCRadar

    Exploitation attested by an external source

  5. 10:21 UTC

    KEV confirmed by The Hacker News

    Exploitation attested by an external source

  6. 05:59 UTC

    Public PoC available

    Public proof-of-concept code published

  7. 09:23 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  8. 19:06 UTC

    CVE published

    Vulnerability disclosed publicly

  9. 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": "Confirmed",
  "cvss_score": 8.1,
  "cvss_estimated": false,
  "epss_score": 0.00891,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 4, "sensors": 1 }
}