EUVD-2026-65214
GHSA-92vc-67q9-382j
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/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
AC:H because a reliable network timing oracle requires controlled low-jitter conditions not present on typical internet paths; PR:N for the unauthenticated reset endpoint; no integrity or availability impact applies.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
The getgrav/grav-plugin-login Composer plugin before 3.9.1 (used by Grav) compares password reset and account activation tokens using a non-constant-time === string comparison instead of hash_equals() in classes/Controller.php (taskReset()) and login.php (activation handler). Because the token-submission endpoint (taskReset) also lacks rate limiting, an attacker could in principle send repeated token guesses against a known username and use the timing differences to attempt to recover a valid token, though the vendor rates the practical exploitability as low and no end-to-end network exploit has been demonstrated.
AnalysisAI
Password reset and account activation token comparison in Grav Login Plugin before 3.9.1 uses PHP's non-constant-time === operator instead of hash_equals(), exposing a CWE-208 timing oracle in both taskReset() (classes/Controller.php) and the activation handler (login.php). Combined with the absence of rate limiting on the token-submission endpoint, an unauthenticated network attacker can submit high-volume repeated token guesses against a known username and statistically recover a valid reset token via timing discrepancy. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | A valid username on the target Grav installation must be known or guessable (usernames may be discoverable through registration flows or public author pages). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 8.7 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H) represents an upper-bound theoretical assessment; the vendor's own characterization of practical exploitability as low, combined with the inherent noise of network-layer timing measurements, substantially reduces realistic risk below what the score implies. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade the grav-plugin-login Composer package to version 3.9.1 or later, which replaces the === token comparison with hash_equals() in both the taskReset() method and the account activation handler; the vendor advisory at https://github.com/getgrav/grav/security/advisories/GHSA-x239-6jqx-5hjh provides upgrade guidance. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Grav CMS installations to identify deployments using Grav Login Plugin before version 3.9.1 by checking the plugins directory and version metadata. …
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Same weakness CWE-208 – Observable Timing Discrepancy
View allSame technique Information Disclosure
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External POC / Exploit Code
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