What is CVE-2026-48849?
In Roundcube Webmail 1.6.x before 1.6.16 and 1.7.x before 1.7.1, an unsanitized subject field in the draft restored value could lead to stored XSS/HTML/CSS injection on shared mailboxes.
The record classifies CVE-2026-48849 under weakness class CWE-79. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs a user to take an action first. 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
- 4.4 — MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N - EPSS (FIRST)
- 0.2% probability of exploitation in the next 30 days, higher than 16.4% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 4.9/10 — 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-2026-48849 being exploited?
Weaponised exploit code for CVE-2026-48849 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 17 in the Threadlinqs vulnerability feed.
Affected products and versions
- Roundcube: Webmail
How to fix CVE-2026-48849
No vendor patch reference has been recorded for CVE-2026-48849 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-2026-48849
1 tracked threat in the Threadlinqs corpus references CVE-2026-48849, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on .