GHSA-5hf6-crg4-fg59medium5.3
Roundcube: Bypass of remote image blocking via crafted BODY background attribute
The advisory, in context
An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. The remote image blocking feature can be bypassed via a crafted background attribute of a BODY element in an e-mail message. This may lead to information disclosure or access-control bypass.
Affected packages
Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.
roundcube/roundcubemail Packagist
Ecosystem versions
From 1.7-beta before 1.7-rc5
Fixed in 1.7-rc5
6 explicitly affected versions
1.7-beta, 1.7-beta2, 1.7-rc, 1.7-rc2, 1.7-rc3, 1.7-rc4
View affected-version evidence
{
"ranges": [
{
"events": [
{
"introduced": "1.7-beta"
},
{
"fixed": "1.7-rc5"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.7-beta",
"1.7-beta2",
"1.7-rc",
"1.7-rc2",
"1.7-rc3",
"1.7-rc4"
]
}References
- https://nvd.nist.gov/vuln/detail/CVE-2026-35542
- https://github.com/roundcube/roundcubemail/commit/e052328e3dc75f13adc2e314eaa4096ac21084ad
- https://github.com/roundcube/roundcubemail/commit/fd0e98178db5c73eaa93d005b561874923f9b0f0
- https://github.com/roundcube/roundcubemail/commit/fde14d01adc9f37893cd82b635883e516ed453f8
- https://github.com/roundcube/roundcubemail
- https://github.com/roundcube/roundcubemail/releases/tag/1.5.14
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.14
- https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
- https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14