CVE-2025-66578 is an authentication bypass vulnerability in xmlseclibs versions 3.1.3 and earlier, a PHP library for XML Encryption and Signatures. The flaw stems from libxml2's canonicalization process, which can return an empty string for invalid XML, leading xmlseclibs to incorrectly compute a DigestValue and bypass authentication. Rated 7.5 HIGH (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N), this vulnerability is remotely exploitable with low attack complexity, allowing for high integrity impact without user interaction. There is currently no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 3.1.4CPE matchmatch criteria | cpe:2.3:a:xmlseclibs_project:xmlseclibs:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:L
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The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.