CVE-2026-104356: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-6654-r2c2-m62r
Share
CVSS 5.9
CWE-338
Published
Advisory Summary

CVE-2026-104356 is a HIGH (CVSS 5.9) security vulnerability vulnerability (CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses a pseudo-random number generator (prng) in a security context, but the prng's algorithm is not cryptographically strong.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-104356 at a Glance

CVE Identifier CVE-2026-104356
GHSA Identifier GHSA-6654-r2c2-m62r
Severity HIGH
CVSS v3.1 Base Score 5.9
CWE Classification CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.9

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:N/A:H).

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 None (I:N)
Availability High (A:H)

How to Fix CVE-2026-104356

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

Verify Direct and Transitive Dependencies

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

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-104356, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software 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: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG), where the product uses a pseudo-random number generator (prng) in a security context, but the prng's algorithm is not cryptographically strong. In Software, 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

PictShare before version 3.7.1 contains a weak randomness vulnerability where the getRandomString() function uses the non-cryptographic rand() PRNG to generate the delete_code authorization token in src/inc/core.php. Attackers can predict or infer the PRNG state to guess valid delete_code values and perform unauthorized deletion of hosted files without needing to read the code from the info endpoint.

References

NVD — CVE-2026-104356 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-104356
Security Fix Commit FIX COMMIT
https://github.com/HaschekSolutions/pictshare/commit/ce5fc474e89769efeae25fee763894bcce3412e3
Software Release RELEASE
https://github.com/HaschekSolutions/pictshare/releases/tag/v3.7.1
www.vulncheck.com/advisories/pictshar... WEB
https://www.vulncheck.com/advisories/pictshare-predictable-delete-code-via-rand

Frequently Asked Questions

What is CVE-2026-104356?
CVE-2026-104356 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG).
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-104356?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-104356?
CVE-2026-104356 has a CVSS v3.1 base score of 5.9 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-104356?
CVE-2026-104356 is classified under CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) (The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong.).
How can I check Maven dependencies for CVE-2026-104356?
Run the dependency tree command: 'mvn dependency:tree'. 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-6654-r2c2-m62r",
  "modified" : "2026-10-02T00:31:30Z",
  "published" : "2026-10-02T00:31:29Z",
  "aliases" : [ "CVE-2026-104356" ],
  "details" : "PictShare before version 3.7.1 contains a weak randomness vulnerability where the getRandomString() function uses the non-cryptographic rand() PRNG to generate the delete_code authorization token in src/inc/core.php. Attackers can predict or infer the PRNG state to guess valid delete_code values and perform unauthorized deletion of hosted files without needing to read the code from the info endpoint.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-104356"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/HaschekSolutions/pictshare/commit/ce5fc474e89769efeae25fee763894bcce3412e3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/HaschekSolutions/pictshare/releases/tag/v3.7.1"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/pictshare-predictable-delete-code-via-rand"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-338" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-10-01T22:17:00Z"
  }
}