Answer in brief
CVE-2026-53440 records a Medium severity (CVSS 4.3) vulnerability in Jenkins: Open Redirect phishing attacks possible via "from" parameter in "Delegate to servlet container". The current sources do not mark it as known exploited. The current feed maps org.jenkins-ci.main:jenkins-core (maven), org.jenkins-ci.main:jenkins-core (maven), org.jenkins-ci.main:jenkins-core (maven), org.jenkins-ci.main:jenkins-core (maven). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps org.jenkins-ci.main:jenkins-core (maven), org.jenkins-ci.main:jenkins-core (maven), org.jenkins-ci.main:jenkins-core (maven), org.jenkins-ci.main:jenkins-core (maven). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| org.jenkins-ci.main:jenkins-coremaven | >=0 <2.555.3 | 2.555.3 |
| org.jenkins-ci.main:jenkins-coremaven | >=2.556 <2.568 | 2.568 |
| org.jenkins-ci.main:jenkins-coremaven | <2.555.3 | 2.555.3 |
| org.jenkins-ci.main:jenkins-coremaven | >=2.556,<2.568 | 2.568 |
Published upstream
Jun 10, 2026
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Aug 13, 2026
Jenkins 2.567 and earlier, LTS 2.555.2 and earlier does not ensure that the "from" parameter in the "Delegate to servlet container" security realm is safe to redirect to after login, allowing attackers to perform phishing attacks by redirecting users to an attacker-controlled domain.
Quoted source text, attributed separately from HOL analysis.