CVE-2026-88859: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-8j98-q77q-pmv2
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CVSS 5.4
CWE-84
Published
Advisory Summary

CVE-2026-88859 is a MODERATE (CVSS 5.4) security vulnerability vulnerability (CWE-84: Improper Neutralization of Encoded URI Schemes in a Web Page) affecting Software libraries in the Maven ecosystem. The weakness occurs when the web application improperly neutralizes user-controlled input for executable script disguised with uri encodings.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-88859 at a Glance

CVE Identifier CVE-2026-88859
GHSA Identifier GHSA-8j98-q77q-pmv2
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-84: Improper Neutralization of Encoded URI Schemes in a Web Page
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.4

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:R/S:U/C:L/I:L/A:N).

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

How to Fix CVE-2026-88859

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-2026-88859, 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-84: Improper Neutralization of Encoded URI Schemes in a Web Page, where the web application improperly neutralizes user-controlled input for executable script disguised with uri encodings. 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

A flaw was found in Evolution. A remote attacker can exploit this vulnerability by sending a specially crafted HTML email containing a spoofed vCard control. When a victim clicks on this control, Evolution's trusted JavaScript handler incorrectly assigns an attacker-controlled JavaScript URL to an iframe's source. This action leads to arbitrary JavaScript execution within the mail-viewing context, effectively bypassing the security measures designed to prevent script execution in email content.

References

NVD — CVE-2026-88859 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-88859
Software Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-88859
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2531401
gitlab.gnome.org/gnome/evolution/-/w... WEB
https://gitlab.gnome.org/GNOME/evolution/-/work_items/3388

Frequently Asked Questions

What is CVE-2026-88859?
CVE-2026-88859 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-84: Improper Neutralization of Encoded URI Schemes in a Web Page.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-88859?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-88859?
CVE-2026-88859 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-88859?
CVE-2026-88859 is classified under CWE-84: Improper Neutralization of Encoded URI Schemes in a Web Page (The web application improperly neutralizes user-controlled input for executable script disguised with URI encodings.).
How can I check Maven dependencies for CVE-2026-88859?
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-8j98-q77q-pmv2",
  "modified" : "2026-09-10T12:31:20Z",
  "published" : "2026-09-10T12:31:20Z",
  "aliases" : [ "CVE-2026-88859" ],
  "details" : "A flaw was found in Evolution. A remote attacker can exploit this vulnerability by sending a specially crafted HTML email containing a spoofed vCard control. When a victim clicks on this control, Evolution's trusted JavaScript handler incorrectly assigns an attacker-controlled JavaScript URL to an iframe's source. This action leads to arbitrary JavaScript execution within the mail-viewing context, effectively bypassing the security measures designed to prevent script execution in email content.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-88859"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2026-88859"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2531401"
  }, {
    "type" : "WEB",
    "url" : "https://gitlab.gnome.org/GNOME/evolution/-/work_items/3388"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-84" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-10T12:16:33Z"
  }
}