CVE-2026-35543: roundcube webmail
CVSS: 5.3v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-35543DEBIAN-CVE-2026-35543
Published 03-04-2026Last modified 03-04-2026
Vulnerability summary
CVE-2026-35543 is a medium (CVSS 5.3) vulnerability in roundcube webmail. EPSS estimates a 0.53% chance of exploitation in the next 30 days, higher than 43.9% of scored vulnerabilities.
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)EPSS score
0.53%
0%100%
Low · +0.13 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 03-04-2026PublishedVulnerability first disclosed.
- 03-04-2026Last modifiedVulnerability information updated.
Description
An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. The remote image blocking feature can be bypassed via SVG content (with animate attributes) in an e-mail message. This may lead to information disclosure or access-control bypass.
CVSS metrics
4 scores · 4 sources · 1 versionMedium 5.3Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS trend
Probability
0.53%
Chance of exploitation in the next 30 days
Percentile
44%
Versus all other CVEs
30-day change
+0.13 pp
From 0.40% on 21-09-2026
21-09-202621-10-2026
EPSS score0.53%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- roundcube< 1.6.5+dfsg-1+deb12u8 | < 1.6.15+dfsg-0+deb13u1 | < 1.6.14+dfsg-1
Roundcube1 product
- webmail< 1.5.14 | ≥ 1.6.0, < 1.6.14
Ubuntu1 product
- roundcubeAll versions (No fix recorded)
3 vendors · 3 products
