fix(security): prevent path traversal in HTML compose img src handler [CVE-2026-58451]#85
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… [CVE-2026-58451] The smiley resolver in IMP_Compose::_convertToRelated() prefix-checked img src URLs with stripos() and rebuilt the filesystem path with str_replace(), leaving any ../ sequences intact. A crafted <img src> in a composed message could read arbitrary web-server-readable files and exfiltrate them in the outgoing MIME body. Tighten the prefix to `/ckeditor/`, reject dot segments, NUL bytes, and non-allowlisted characters in the URL tail, and require realpath() containment under the resolved ckeditor directory before file_get_contents(). Reported by evan. Coordinated by VulnCheck.
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hello @ralflang thanks |
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Hi @cheese1 I haven't validated - I don't have any H5 / IMP 6 instances anymore. If you would care to test I would backport it but I am not sure I can create a proper pear tgz still. |
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The smiley resolver in IMP_Compose::_convertToRelated() prefix-checked![]()
img src URLs with stripos() and rebuilt the filesystem path with
str_replace(), leaving any ../ sequences intact. A crafted
in a composed message could read arbitrary web-server-readable files
and exfiltrate them in the outgoing MIME body.
Tighten the prefix to
/ckeditor/, reject dot segments, NUL bytes,and non-allowlisted characters in the URL tail, and require
realpath() containment under the resolved ckeditor directory before
file_get_contents().
Reported by evan. Coordinated by VulnCheck.