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MEDIUM severity

CVE-2026-48924 — bitbucket-oauth

MEDIUM

CVE-2026-48924 is a medium-severity (CVSS 4.3) Open Redirect vulnerability in org.jenkins-ci.plugins:bitbucket-oauth. A fix is available for org.jenkins-ci.plugins:bitbucket-oauth — see the affected versions and patch details below.

Jenkins Bitbucket OAuth Plugin does not restrict the redirect URL after login

Also known asGHSA-r8fj-rff6-f7h5
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-48924.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs24th percentile — riskier than 24% of all scored CVEsHighest risk
0.00%0.28%0.55%0.83%0.0%0.3%Jun 26Sep 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-48924 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 384,534 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
☕org.jenkins-ci.plugins:bitbucket-oauth

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.jenkins-ci.plugins:bitbucket-oauthall versions0.18org.jenkins-ci.plugins:bitbucket-oauth:0.18

Affected Products

1 product · 1 configurations
Application
bitbucket oauthjenkins
≤ 0.17
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jenkins-ci.plugins:bitbucket-oauth, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.jenkins-ci.plugins:bitbucket-oauth to 0.18 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-48924 is resolved across your whole dependency graph.

  3. Workarounds

    Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2026-48924: bitbucket-oauth — Fixed in 0.18