CVE-2026-84203: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-47v8-26mf-hw38
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CVSS 8.1
CWE-613
Published
Advisory Summary

CVE-2026-84203 is a HIGH (CVSS 8.1) security vulnerability vulnerability (CWE-613: Insufficient Session Expiration) affecting Software libraries in the Maven ecosystem. The weakness occurs when according to wasc, "insufficient session expiration is when a web site permits an attacker to reuse old session credentials or session ids for authorization.". Remediation is available in the latest vendor maintenance releases.

CVE-2026-84203 at a Glance

CVE Identifier CVE-2026-84203
GHSA Identifier GHSA-47v8-26mf-hw38
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-613: Insufficient Session Expiration
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.1

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

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

How to Fix CVE-2026-84203

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-2026-84203, 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-613: Insufficient Session Expiration, where according to wasc, "insufficient session expiration is when a web site permits an attacker to reuse old session credentials or session ids for authorization.". 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

Memos versions 0.26.0 through 0.30.0 fail to revoke refresh tokens when a user changes their password, allowing attackers to maintain account access. An attacker with a stolen refresh token can call the RefreshToken RPC to obtain new access tokens and rotate the refresh token indefinitely, bypassing the password change security measure.

References

NVD — CVE-2026-84203 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-84203
Software Source Repository REPOSITORY
https://github.com/usememos/memos
Software Source Repository REPOSITORY
https://github.com/usememos/memos/blob/v0.30.0/server/auth/authenticator.go
Software Source Repository REPOSITORY
https://github.com/usememos/memos/blob/v0.30.0/server/router/api/v1/user_service.go
www.vulncheck.com/advisories/memos-0.... WEB
https://www.vulncheck.com/advisories/memos-0.26.0-through-0.30.0-insufficient-session-expiration-on-password-change

Frequently Asked Questions

What is CVE-2026-84203?
CVE-2026-84203 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-613: Insufficient Session Expiration.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-84203?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-84203?
CVE-2026-84203 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-84203?
CVE-2026-84203 is classified under CWE-613: Insufficient Session Expiration (According to WASC, "Insufficient Session Expiration is when a web site permits an attacker to reuse old session credentials or session IDs for authorization.").
How can I check Maven dependencies for CVE-2026-84203?
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-47v8-26mf-hw38",
  "modified" : "2026-09-01T18:30:44Z",
  "published" : "2026-09-01T18:30:44Z",
  "aliases" : [ "CVE-2026-84203" ],
  "details" : "Memos versions 0.26.0 through 0.30.0 fail to revoke refresh tokens when a user changes their password, allowing attackers to maintain account access. An attacker with a stolen refresh token can call the RefreshToken RPC to obtain new access tokens and rotate the refresh token indefinitely, bypassing the password change security measure.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/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"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-84203"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/usememos/memos"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/usememos/memos/blob/v0.30.0/server/auth/authenticator.go"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/usememos/memos/blob/v0.30.0/server/router/api/v1/user_service.go"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/memos-0.26.0-through-0.30.0-insufficient-session-expiration-on-password-change"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-613" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-01T16:17:34Z"
  }
}