CVE-2026-48924: Bitbucket oauth Jenkins Bitbucket OAuth Plugin Does Vulnerability

MODERATE
Advisory Identifier: GHSA-r8fj-rff6-f7h5
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CVSS 4.3
CWE-601
Published
Advisory Summary

CVE-2026-48924 is a MODERATE (CVSS 4.3) jenkins bitbucket oauth plugin does vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Bitbucket oauth libraries in the Maven ecosystem. The issue involves jenkins bitbucket oauth plugin does not restrict the redirect url after login. Remediation is available by upgrading affected packages to version 0.18.

CVE-2026-48924 at a Glance

CVE Identifier CVE-2026-48924
GHSA Identifier GHSA-r8fj-rff6-f7h5
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Bitbucket oauth
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:N/UI:R/S:U/C:N/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 None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-48924

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

org.jenkins-ci.plugins:bitbucket-oauth fixed: 0.18 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>bitbucket-oauth</artifactId>
    <version>0.18</version>
</dependency>
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 -Dincludes=org.jenkins-ci.plugins

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-48924, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.jenkins-ci.plugins

Analyze the terminal output to locate any version of Bitbucket oauth in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.18), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.jenkins-ci.plugins 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-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In Bitbucket oauth, 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

Jenkins Bitbucket OAuth Plugin 0.17 and earlier does not restrict the redirect URL after login. This allows attackers to perform phishing attacks by having users go to a Jenkins URL that will forward them to a different site after successful authentication. Bitbucket OAuth Plugin 0.18 only redirects to relative (Jenkins) URLs.

CVE-2026-48924 Affected Bitbucket oauth Versions

1 component(s)
Fixed Versions:
0.18
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:bitbucket-oauth
maven/org.jenkins-ci.plugins/bitbucket-oauth
Maven
< 0.18
0.18

References

NVD — CVE-2026-48924 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-48924
Bitbucket oauth Source Repository REPOSITORY
https://github.com/jenkinsci/bitbucket-oauth-plugin
Bitbucket oauth Security Information SECURITY
https://www.jenkins.io/security/advisory/2026-05-27/#SECURITY-3761

Frequently Asked Questions

What is CVE-2026-48924?
CVE-2026-48924 is a security vulnerability in Bitbucket oauth involving Jenkins Bitbucket OAuth Plugin does not restrict the redirect URL after login under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Bitbucket oauth versions are affected?
Affected versions include releases prior to 0.18 across affected packages: org.jenkins-ci.plugins:bitbucket-oauth.
What version fixes CVE-2026-48924?
Upgrading to 0.18 (or the latest patched release for your respective branch) resolves the vulnerability.
Is bitbucket-oauth affected?
Yes, org.jenkins-ci.plugins:bitbucket-oauth is affected in releases prior to 0.18. Upgrade your dependency to 0.18 or later.
What is the CVSS score of CVE-2026-48924?
CVE-2026-48924 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2026-48924?
CVE-2026-48924 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check Maven dependencies for CVE-2026-48924?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.jenkins-ci.plugins'. 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-r8fj-rff6-f7h5",
  "modified" : "2026-07-01T19:43:52Z",
  "published" : "2026-05-27T15:33:27Z",
  "aliases" : [ "CVE-2026-48924" ],
  "summary" : "Jenkins Bitbucket OAuth Plugin does not restrict the redirect URL after login",
  "details" : "Jenkins Bitbucket OAuth Plugin 0.17 and earlier does not restrict the redirect URL after login.\n\nThis allows attackers to perform phishing attacks by having users go to a Jenkins URL that will forward them to a different site after successful authentication.\n\nBitbucket OAuth Plugin 0.18 only redirects to relative (Jenkins) URLs.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:bitbucket-oauth"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.18"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.17"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-48924"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/bitbucket-oauth-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2026-05-27/#SECURITY-3761"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-01T19:43:52Z",
    "nvd_published_at" : "2026-05-27T15:16:32Z"
  }
}