4.4

CVE-2026-48849: roundcube webmail Cross-site Scripting

CVSS: 4.4v3.1MediumDeferred
AliasesUBUNTU-CVE-2026-48849DEBIAN-CVE-2026-48849
Published 25-05-2026Last modified 26-05-2026
Open JSON

Vulnerability summary

CVE-2026-48849 is a medium (CVSS 4.4) Cross-site Scripting vulnerability in roundcube webmail. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.8% of scored vulnerabilities.

Overall risk
18/100
0100
Low · default modelHow is this calculated?
CVSS score
4.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.26%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 1
MGASA-2026-0194OPENSUSE-SU-2026:10869-1

Timeline

  1. 25-05-2026
    PublishedVulnerability first disclosed.
  2. 26-05-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

+0.02 pp

From 0.24% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.26%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • roundcube< 1.6.5+dfsg-1+deb12u9 | < 1.6.16+dfsg-0+deb13u1 | < 1.6.16+dfsg-1
Roundcube1 product
  • webmail≥ 1.6.0, < 1.6.16 | ≥ 1.7.0, < 1.7.1
Ubuntu1 product
  • roundcubeAll versions (No fix recorded)

3 vendors · 3 products

References

8 links