Pre-auth SSRF via PDO DSN injection
Published Aug 25, 2026 · Updated Aug 26, 2026
Server-side request forgery in Adminer before 5.5.0 allows remote attackers to reach internal TCP services through the login form. The host_port() parser accepts a nonnumeric port suffix, and PDO drivers interpolate it unquoted into a DSN where injected host and port keys override the validated target. Access to the unauthenticated login page is sufficient to probe internal hosts and ports through response timing and connection errors.
Summary
What happened
Server-side request forgery in Adminer before 5.5.0 allows remote attackers to reach internal TCP services through the login form. The host_port() parser accepts a nonnumeric port suffix, and PDO drivers interpolate it unquoted into a DSN where injected host and port keys override the validated target. Access to the unauthenticated login page is sufficient to probe internal hosts and ports through response timing and connection errors.
The record
- CVE
- CVE-2026-34964
- Published
- Aug 25, 2026
- Updated
- Aug 26, 2026
- Vendor
- Adminer
- Product
- Adminer
- Classifications
- CWE-918, CAPEC-664, T1046, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 25, 2026CVE publishedPublication date reported by the CVE source.
- Aug 26, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <5.5.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-58cq-mgw2-38m5 proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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