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phpMyFAQ EUVDEUVD-2026-62453

| CVE-2026-76212 MEDIUM
Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') (CWE-88)
2026-08-19 VulnCheck GHSA-jj45-w38g-gfrj
PHP PostgreSQL Denial Of Service SQLi Phpmyfaq
6.9
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.3 MEDIUM

Network-accessible public search form requires no privileges or interaction; availability impact is Low as DoS is query-rate-dependent and confined to the vulnerable system.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Aug 19, 2026 - 15:17 EUVD
Analysis Generated
Aug 19, 2026 - 15:04 vuln.today

DescriptionCVE.org

phpMyFAQ before 4.1.7, when configured to use PostgreSQL via the native pgsql PHP extension, declares an incorrect LIKE ESCAPE character ('=') in the Search/Database/Pgsql.php backend while escapeLikeWildcards() escapes user input with the '|' prefix. As a result, wildcard escaping is a no-op and user-supplied % and _ characters remain active LIKE wildcards. An unauthenticated attacker can submit such characters in the public FAQ search form to force maximally broad pattern matches and expensive sequential scans, resulting in a denial of service. The PDO PostgreSQL backend is not affected, and quotes remain escaped so this does not enable quote-breaking SQL injection or data exfiltration.

AnalysisAI

Wildcard injection in phpMyFAQ before 4.1.7 allows unauthenticated attackers to cause denial of service via the public FAQ search form when the application is running against PostgreSQL through PHP's native pgsql extension. The underlying defect is a character mismatch in LIKE escape handling: Search/Database/Pgsql.php declares '=' as the LIKE ESCAPE character but escapeLikeWildcards() prefixes user input with '|', making wildcard sanitization entirely inert. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Identify public phpMyFAQ search endpoint
Delivery
Submit search queries containing % or _ wildcard characters
Exploit
Bypass inert LIKE wildcard sanitization in native pgsql backend
Install
Force PostgreSQL full sequential table scan per request
C2
Repeat at high frequency
Execute
Exhaust database CPU and I/O
Impact
Deny service to legitimate users
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Vulnerability AssessmentAI

Exploitation Exploitation requires phpMyFAQ to be deployed with PHP's native pgsql extension as the PostgreSQL backend - the PDO PostgreSQL driver is explicitly unaffected and not exploitable via this flaw. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N) scores 6.9 and accurately reflects a remotely triggerable, low-complexity availability impact with zero confidentiality or integrity consequence. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated attacker identifies a publicly accessible phpMyFAQ instance configured with the native pgsql PHP extension. The attacker submits rapid, repeated search queries consisting of only % characters, which pass through the broken wildcard sanitization and cause PostgreSQL to execute full sequential table scans on each request. …
Remediation The primary remediation is to upgrade phpMyFAQ to version 4.1.7 or later, which corrects the LIKE ESCAPE character mismatch in Search/Database/Pgsql.php. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-62453 vulnerability details – vuln.today
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