HOMEVULNERABILITIESCVE-2026-35545
HIGH

CVE-2026-35545

CWE-669Published: April 3, 2026· Updated: Apr 7, 2026

8.2
CVSS v3.1
EPSS:0.03%probability of exploitation in 30 daysPercentile:10.1th

Official Description

An issue was discovered in Roundcube Webmail before 1.5.15 and 1.6.15. The remote image blocking feature can be bypassed via SVG content in an e-mail message. This may lead to information disclosure or access-control bypass. This involves the animate element with attributeName=fill/filter/stroke.

NVD Source

Technical Analysis

CVE-2026-35545 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 8.2.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected Vendors & Products

roundcube1 product
webmail
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/roundcube/roundcubemail/commit/7ad62de184368bf42c0f522d1aacc030f5ddcc46
PATCHhttps://github.com/roundcube/roundcubemail/commit/9d18d524f3cc211003fc99e2e54eed09a2f3da88
PATCHhttps://github.com/roundcube/roundcubemail/commit/fe1320b199d3a2f58351bb699c9ed4316e73221b
ADVISORYhttps://roundcube.net/news/2026/03/29/security-updates-1.7-rc6-1.6.15-1.5.15

All References (7)

→
https://github.com/roundcube/roundcubemail/commit/7ad62de184368bf42c0f522d1aacc030f5ddcc46Patch
→
https://github.com/roundcube/roundcubemail/commit/9d18d524f3cc211003fc99e2e54eed09a2f3da88Patch
→
https://github.com/roundcube/roundcubemail/commit/fe1320b199d3a2f58351bb699c9ed4316e73221bPatch
→
https://github.com/roundcube/roundcubemail/releases/tag/1.5.15Release Notes
→
https://github.com/roundcube/roundcubemail/releases/tag/1.6.15Release Notes
→
https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc6Release Notes
→
https://roundcube.net/news/2026/03/29/security-updates-1.7-rc6-1.6.15-1.5.15Vendor Advisory

Quick Facts

CVE IDCVE-2026-35545
CVSS Score8.2 / 10
SeverityHIGH
WeaknessCWE-669
CISA KEVNo
EPSS (30d)0.03%
Affected1 vendor
PublishedApr 3, 2026

Related CVEs (CWE-669)

CVE-2026-33265
9.0
CVE-2025-41660
8.8
CVE-2026-24708
8.2
CVE-2026-42997
7.7
CVE-2026-12068
7.4
CVE-2026-48831
7.3

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-35545 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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