Medium severity · published Aug 25, 2026
CVE-2026-56704
Adminer before 5.4.3 Cross-Site Scripting via MySQL Version String
6.1
CVSS
0.3%
EPSS
No
On KEV
Description
Adminer before 5.4.3 inserts unsanitized database server version strings into script tags with valid CSP nonces without proper validation. Attackers controlling a rogue MySQL server can return crafted version strings that break out of the JavaScript context and execute arbitrary code, bypassing Content Security Policy protections.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AD
adminer · vrana
before 5.4.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56704
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56704
github.com
https://github.com/vrana/adminer/security/advisories/GHSA-h6jr-7pr6-grgj
www.vulncheck.com
https://www.vulncheck.com/advisories/adminer-before-cross-site-scripting-via-mysql-version-string
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