Kentico Xperience CMS Authentication Bypass Using an Alternate Path or Channel Vulnerability
An authentication bypass vulnerability in Kentico Xperience allows authentication bypass via the Staging Sync Server password handling of empty SHA1 usernames in digest authentication. Authentication bypass allows an attacker to control…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 4 / 5
- KEV catalog (CISA)20 Oct 2025
- Exploited in EUVD (ENISA)20 Oct 2025
- Used by ransomwareno
- EPSS above 10 %74.1%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
An authentication bypass vulnerability in Kentico Xperience allows authentication bypass via the Staging Sync Server password handling of empty SHA1 usernames in digest authentication. Authentication bypass allows an attacker to control administrative objects.This issue affects Xperience through 13.0.172.
Affected products
- 0 ≤13.0.172
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
-
EPSS peak: 74.1%
References
Other exploited vulnerabilities from the same vendor
- CVE-2025-2749Kentico Xperience Path Traversal Vulnerability4.2 · Background exploitation
- CVE-2025-2747Kentico Xperience CMS Authentication Bypass Using an Alternate Path or Channel Vulnerability9.2 · Background exploitation
- CVE-2019-10068Kentico Xperience Deserialization of Untrusted Data Vulnerability9.2 · Background exploitation