Answer in brief
CVE-2026-53436 records a Medium severity (CVSS 4.3) vulnerability in Jenkins Open Redirect via Relative Path Segments in Post-Login Redirect URL. 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 | >=2.556 <2.568 | 2.568 |
| 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 |
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 improperly determines that a redirect URL after login is legitimately pointing to Jenkins when it contains relative path segments (`./` or `../`), allowing attackers to perform phishing attacks.
Quoted source text, attributed separately from HOL analysis.