CVE-2026-81033: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-p996-89cm-88c6
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CVSS 5.3
CWE-204
Published
Advisory Summary

CVE-2026-81033 is a MODERATE (CVSS 5.3) security vulnerability vulnerability (CWE-204: Observable Response Discrepancy) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-81033 at a Glance

CVE Identifier CVE-2026-81033
GHSA Identifier GHSA-p996-89cm-88c6
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-204: Observable Response Discrepancy
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.3

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

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

How to Fix CVE-2026-81033

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-2026-81033, 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-204: Observable Response Discrepancy, where the product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere. 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

Automatisch reveals whether an address is registered through the response to its forgot-password request. The controller at packages/backend/src/controllers/internal/api/v1/users/forgot-password.js looks the address up and chains a not-found throw onto the query, so an address with no account raises an error that the global handler renders as a not-found status, while a registered address proceeds to send the reset message and returns no-content. The route is mounted without authentication. Submitting candidate addresses and comparing the two status codes therefore establishes which addresses hold accounts, with no credential and no rate limiting in the path.

References

NVD — CVE-2026-81033 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-81033
Software Source Repository REPOSITORY
https://github.com/automatisch/automatisch/issues/2713
Software Source Repository REPOSITORY
https://github.com/automatisch/automatisch
Software Source Repository REPOSITORY
https://github.com/automatisch/automatisch/blob/v0.15.0/packages/backend/src/controllers/internal/api/v1/users/forgot-password.js
www.vulncheck.com/advisories/automati... WEB
https://www.vulncheck.com/advisories/automatisch-through-0.15.0-user-enumeration-via-forgot-password-response-discrepancy

Frequently Asked Questions

What is CVE-2026-81033?
CVE-2026-81033 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-204: Observable Response Discrepancy.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-81033?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-81033?
CVE-2026-81033 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-81033?
CVE-2026-81033 is classified under CWE-204: Observable Response Discrepancy (The product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere.).
How can I check Maven dependencies for CVE-2026-81033?
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-p996-89cm-88c6",
  "modified" : "2026-08-26T18:31:56Z",
  "published" : "2026-08-26T18:31:56Z",
  "aliases" : [ "CVE-2026-81033" ],
  "details" : "Automatisch reveals whether an address is registered through the response to its forgot-password request. The controller at packages/backend/src/controllers/internal/api/v1/users/forgot-password.js looks the address up and chains a not-found throw onto the query, so an address with no account raises an error that the global handler renders as a not-found status, while a registered address proceeds to send the reset message and returns no-content. The route is mounted without authentication. Submitting candidate addresses and comparing the two status codes therefore establishes which addresses hold accounts, with no credential and no rate limiting in the path.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-81033"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/automatisch/automatisch/issues/2713"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/automatisch/automatisch"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/automatisch/automatisch/blob/v0.15.0/packages/backend/src/controllers/internal/api/v1/users/forgot-password.js"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/automatisch-through-0.15.0-user-enumeration-via-forgot-password-response-discrepancy"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-204" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-26T16:16:46Z"
  }
}