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VulnerabilityCVE-2026-48842Published 2026-05-25

CVE-2026-48842 — Roundcube Webmail

highPublic exploit3 PoC repos

As of 2026-09-25, CVE-2026-48842 is a HIGH-severity vulnerability in Roundcube Webmail, CVSS v3.1 8.1, EPSS 0.8% (58.1th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-48842, most recently “Roundcube Webmail Pre-Auth SQL Injection in virtuser_query Plugin (CVE-2026-48842) — Patched in 1.6.16 / 1.7.1 Alongside 7 Other Vulnerabilities”.

CVSS v3.1
8.1/10High
EPSS
0.8%Higher than 58.1% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
1Campaigns referencing it
Priority
8.4/10Threadlinqs triage score
Published
Updated 2026-09-25
CVSS v3.1 8.1 (HIGH) · EPSS 0.8% (higher than 58.1% of all scored CVEs) · Priority 8.4/10 · Published 2026-05-25

Last updated:

What is CVE-2026-48842?

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.

The record classifies CVE-2026-48842 under weakness class CWE-89. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 156 days ago.

Severity and exploitation probability

CVSS v3.1 base score
8.1 — HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
0.8% probability of exploitation in the next 30 days, higher than 58.1% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
8.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-05-25, last modified 2026-09-25

Is CVE-2026-48842 being exploited?

Weaponised exploit code for CVE-2026-48842 is publicly available. 3 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 28 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-48842

No vendor patch reference has been recorded for CVE-2026-48842 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-48842

1 tracked threat in the Threadlinqs corpus references CVE-2026-48842, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .

Other references