Threat Intelligence / CVE / CVE-2026-48842

CVE-2026-48842 — Roundcube Webmail

CVSS v3.1 8.1 (HIGH) · EPSS 0.0% (higher than 22.8% of all scored CVEs) · Priority 5/10 · Published 2026-05-25

As of 2026-05-26, CVE-2026-48842 is a HIGH-severity vulnerability in Roundcube Webmail, CVSS v3.1 8.1, EPSS 0.0% (22.8th 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”.

Last updated: 2026-05-26

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 110 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): 0.0% probability of exploitation in the next 30 days, higher than 22.8% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-05-25, last modified 2026-05-26

Is CVE-2026-48842 being exploited?

It currently carries a trending score of 13 in the Threadlinqs vulnerability feed.

Affected products and versions

Roundcube: Webmail

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.

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 — HIGH · 2026-05-28

Sources

Seeded from cveorg and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2026-48842 are available via the Threadlinqs MCP server (Purple tier). View plans →

← all vulnerabilities · Markdown version · Threadlinqs Intelligence