CVE-2026-90679: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-5cjj-j77f-rq2g
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CVSS 4.3
CWE-348
Published
Advisory Summary

CVE-2026-90679 is a MODERATE (CVSS 4.3) security vulnerability vulnerability (CWE-348: Use of Less Trusted Source) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product has two different sources of the same data or information, but it uses the source that has less support for verification, is less trusted, or is less resistant to attack.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-90679 at a Glance

CVE Identifier CVE-2026-90679
GHSA Identifier GHSA-5cjj-j77f-rq2g
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-348: Use of Less Trusted Source
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.3

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:N/I:L/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 None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-90679

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-2026-90679, 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-348: Use of Less Trusted Source, where the product has two different sources of the same data or information, but it uses the source that has less support for verification, is less trusted, or is less resistant to attack. 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

Forgejo 13.0.0 through 16.0.4, when "[federation] ENABLED = true" is set, has a spoofing issue that affects identity integrity but does not allow account takeover or content modification. It does not verify that the HTTP Signature on an incoming ActivityPub activity was produced by the key belonging to the actor named in the activity body. The signature verification in routers/api/v1/activitypub/reqsignature.go validates the request signature, but the inbox activity handlers subsequently read the acting identity from the attacker-controlled JSON body without binding it to the verified signing key. Additionally, the signed Digest header is not recomputed against the received request body. A remote attacker who hosts a single valid ActivityPub actor and keypair can therefore submit signature-valid activities attributed to any actor identity they name.

References

NVD — CVE-2026-90679 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90679
codeberg.org/forgejo/forgejo/iss... WEB
https://codeberg.org/forgejo/forgejo/issues/14271#issuecomment-22548004

Frequently Asked Questions

What is CVE-2026-90679?
CVE-2026-90679 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-348: Use of Less Trusted Source.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-90679?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-90679?
CVE-2026-90679 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2026-90679?
CVE-2026-90679 is classified under CWE-348: Use of Less Trusted Source (The product has two different sources of the same data or information, but it uses the source that has less support for verification, is less trusted, or is less resistant to attack.).
How can I check Maven dependencies for CVE-2026-90679?
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-5cjj-j77f-rq2g",
  "modified" : "2026-09-13T06:33:11Z",
  "published" : "2026-09-13T06:33:11Z",
  "aliases" : [ "CVE-2026-90679" ],
  "details" : "Forgejo 13.0.0 through 16.0.4, when \"[federation] ENABLED = true\" is set, has a spoofing issue that affects identity integrity but does not allow account takeover or content modification. It does not verify that the HTTP Signature on an incoming ActivityPub activity was produced by the key belonging to the actor named in the activity body. The signature verification in routers/api/v1/activitypub/reqsignature.go validates the request signature, but the inbox activity handlers subsequently read the acting identity from the attacker-controlled JSON body without binding it to the verified signing key. Additionally, the signed Digest header is not recomputed against the received request body. A remote attacker who hosts a single valid ActivityPub actor and keypair can therefore submit signature-valid activities attributed to any actor identity they name.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-90679"
  }, {
    "type" : "WEB",
    "url" : "https://codeberg.org/forgejo/forgejo/issues/14271#issuecomment-22548004"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-348" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-13T04:17:25Z"
  }
}