GHSA-px9v-979x-qmh9: Duplicate Advisory Grav: Non Constant Time Nonce Vulnerability

MODERATE
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CVSS 3.7
CWE-208
Published
Advisory Summary

GHSA-px9v-979x-qmh9 is a MODERATE (CVSS 3.7) grav: non constant time nonce vulnerability (CWE-208: Observable Timing Discrepancy) affecting Duplicate Advisory libraries in the Packagist ecosystem. The issue involves grav: non constant time nonce comparison in utils::verifynonce() used for csrf protection. Remediation is available in the latest vendor maintenance releases.

GHSA-px9v-979x-qmh9 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-px9v-979x-qmh9
Severity MODERATE
CVSS v3.1 Base Score 3.7
CWE Classification CWE-208: Observable Timing Discrepancy
Affected Product Duplicate Advisory
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 3.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix GHSA-px9v-979x-qmh9

To remediate this vulnerability, upgrade all affected Duplicate Advisory dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

getgrav/grav fixed: Latest secure release 
Upgrade getgrav/grav to Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for getgrav/grav

How to Check if You Are Affected

To determine whether your application is affected by GHSA-px9v-979x-qmh9, inspect your project dependencies for Duplicate Advisory:

inspect dependencies for getgrav/grav

Analyze the terminal output to locate any version of Duplicate Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-208: Observable Timing Discrepancy, where two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. In Duplicate Advisory, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-38p6-h87p-r4cg. This link is maintained to preserve external references. ### Original Description Grav CMS before 2.0.16 contains a timing vulnerability in Utils::verifyNonce() that uses non-constant-time string comparison with the === operator instead of hash_equals() for CSRF nonce validation. Attackers can measure response timing differences to recover valid nonce values byte-by-byte through multiple requests, weakening CSRF protection below its intended security margin.

GHSA-px9v-979x-qmh9 Affected Duplicate Advisory Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
getgrav/grav
 Packagist

References

GitHub Advisory / Wiki ADVISORY
https://github.com/getgrav/grav/security/advisories/GHSA-38p6-h87p-r4cg
NVD — GHSA-px9v-979x-qmh9 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-72701
www.vulncheck.com/advisories/grav-cms... WEB
https://www.vulncheck.com/advisories/grav-cms-before-timing-attack-via-verifynonce

Frequently Asked Questions

What is GHSA-px9v-979x-qmh9?
GHSA-px9v-979x-qmh9 is a security vulnerability in Duplicate Advisory involving Grav: Non constant time nonce comparison in Utils::verifyNonce() used for CSRF protection under CWE-208: Observable Timing Discrepancy.
Which Duplicate Advisory versions are affected?
Affected versions include releases prior to current release patches across affected packages: getgrav/grav.
What version fixes GHSA-px9v-979x-qmh9?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is getgrav/grav affected?
Yes, getgrav/grav is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of GHSA-px9v-979x-qmh9?
GHSA-px9v-979x-qmh9 has a CVSS v3.1 base score of 3.7 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with GHSA-px9v-979x-qmh9?
GHSA-px9v-979x-qmh9 is classified under CWE-208: Observable Timing Discrepancy (Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.).
How can I check Packagist dependencies for GHSA-px9v-979x-qmh9?
Run the dependency tree command: 'inspect dependencies for getgrav/grav'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-px9v-979x-qmh9",
  "modified" : "2026-09-17T20:24:49Z",
  "published" : "2026-08-25T03:32:09Z",
  "withdrawn" : "2026-09-17T20:24:49Z",
  "aliases" : [ ],
  "summary" : "Duplicate Advisory: Grav: Non constant time nonce comparison in Utils::verifyNonce() used for CSRF protection",
  "details" : "### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-38p6-h87p-r4cg. This link is maintained to preserve external references.\n\n### Original Description\nGrav CMS before 2.0.16 contains a timing vulnerability in Utils::verifyNonce() that uses non-constant-time string comparison with the === operator instead of hash_equals() for CSRF nonce validation. Attackers can measure response timing differences to recover valid nonce values byte-by-byte through multiple requests, weakening CSRF protection below its intended security margin.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "getgrav/grav"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "< 2.0.16"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/getgrav/grav/security/advisories/GHSA-38p6-h87p-r4cg"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-72701"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/grav-cms-before-timing-attack-via-verifynonce"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-208" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-17T20:24:49Z",
    "nvd_published_at" : "2026-08-25T02:16:45Z"
  }
}