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Phalcon CVE-2026-54736

| EUVDEUVD-2026-43097 HIGH
Observable Timing Discrepancy (CWE-208)
2026-07-10 GitHub_M
Information Disclosure PHP Cphalcon
8.2
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.2 HIGH
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/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
5.9 MEDIUM

Network-reachable timing oracle with no auth (AV:N/PR:N) but many samples needed against jitter (AC:H); impact is forged-content acceptance, so I:H with C:N/A:N.

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

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/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
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jul 10, 2026 - 23:02 EUVD
Analysis Generated
Jul 10, 2026 - 21:53 vuln.today

DescriptionCVE.org

Phalcon is a high-performance, full-stack PHP framework. Prior to 5.14.1, Phalcon\Encryption\Crypt::decrypt compares the attacker-supplied HMAC tag against the freshly computed HMAC using PHP/Zephir identity comparison, which lowers to a byte-wise comparison that returns early on the first differing byte. This observable timing discrepancy can allow an attacker to recover a valid tag byte-by-byte and attach it to a chosen IV and ciphertext so that decrypt() accepts tampered encrypted content as authentic. This issue is fixed in version 5.14.1.

AnalysisAI

Authentication-bypass via timing side-channel in Phalcon's Crypt::decrypt (cphalcon PHP framework prior to 5.14.1) allows remote attackers to forge valid HMAC tags and have tampered ciphertext accepted as authentic. Because the HMAC verification uses PHP/Zephir identity comparison that short-circuits on the first mismatching byte, an attacker who can observe response timing can recover a valid tag byte-by-byte and break the encrypt-then-MAC integrity guarantee. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify endpoint using Crypt::decrypt
Delivery
Submit chosen IV+ciphertext with guessed tag
Exploit
Measure verification timing per byte
Execution
Recover valid HMAC byte-by-byte
Persist
Attach forged tag to tampered ciphertext
Impact
decrypt() accepts tampered content as authentic
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Vulnerability AssessmentAI

Exploitation Exploitation requires an application that calls Phalcon\Encryption\Crypt::decrypt on attacker-influenced input and exposes an observable timing signal (or error/latency oracle) reflecting HMAC verification. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor CVSS 4.0 score is 8.2 (High) with vector AV:N/AC:H/AT:N/PR:N/UI:N and VI:H while VC:N/VA:N, meaning the sole impact is to integrity - an attacker can get forged/tampered ciphertext accepted, but confidentiality and availability are not directly affected. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An application uses Phalcon\Encryption\Crypt to encrypt-then-HMAC a client-visible token (e.g. an authenticated cookie or state blob). …
Remediation Vendor-released patch: 5.14.1 - upgrade the cphalcon extension to 5.14.1 or later, which replaces the short-circuiting identity comparison with a constant-time HMAC check (fix commit ad53ab1b2e7ec59b3af92b0b37b8aaa099011137 via PR https://github.com/phalcon/cphalcon/pull/17091, release https://github.com/phalcon/cphalcon/releases/tag/v5.14.1). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

24 hours: Inventory all systems running Phalcon and document current versions. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-54736 vulnerability details – vuln.today
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