CVE-2020-2103

Jenkins Diagnostic page exposed session cookies

5.4 MediumFix available

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier exposed session identifiers on a user's detail object in the whoAmI diagnostic page.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

7.04%Up 5.6 points since Apr 14, 2021

What each source reports

NVD Score used 5.4

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier exposed session identifiers on a user's detail object in the whoAmI diagnostic page.

Record: CVE-2020-2103
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 4.0 MediumAV:N/AC:L/Au:S/C:N/I:P/A:N
Weakness: CWE-200
Updated: 2026-11-02

CVE List No score

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier exposed session identifiers on a user's detail object in the whoAmI diagnostic page.

Record: CVE-2020-2103
Updated: 2026-11-02

EUVDEUVD-2022-2399 No score

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier exposed session identifiers on a user's detail object in the whoAmI diagnostic page.

Record: EUVD-2022-2399
Updated: 2026-11-03

GitHub AdvisoriesGHSA-4jjj-cm7q-v6hr 5.4

Jenkins Diagnostic page exposed session cookies

Jenkins shows various technical details about the current user on the /whoAmI page. In a previous fix, the Cookie header value containing the HTTP session ID was redacted. However, user metadata shown on this page could also include the HTTP session ID in Jenkins 2.218 and earlier, LTS 2.204.1 and earlier.

This allows attackers able to exploit a cross-site scripting vulnerability to obtain the HTTP session ID value from this page.

Jenkins 2.219, LTS 2.204.2 no longer prints out the affected user metadata that might contain the HTTP session ID.

Additionally, we also redact values of further authentication-related HTTP headers in addition to Cookie on this page as a hardening.

Record: GHSA-4jjj-cm7q-v6hr
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-200
Updated: 2026-11-02

OSV 5.4

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier exposed session identifiers on a user's detail object in the whoAmI diagnostic page.

Record: CVE-2020-2103
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVGHSA-4jjj-cm7q-v6hr 5.4

Jenkins Diagnostic page exposed session cookies

This allows attackers able to exploit a cross-site scripting vulnerability to obtain the HTTP session ID value from this page.

Jenkins 2.219, LTS 2.204.2 no longer prints out the affected user metadata that might contain the HTTP session ID.

Additionally, we also redact values of further authentication-related HTTP headers in addition to Cookie on this page as a hardening.

Record: GHSA-4jjj-cm7q-v6hr
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-200
Updated: 2026-11-02

OSVRHBA-2020:0402 8.6

Red Hat Bug Fix Advisory: OpenShift Container Platform 3.11 bug fix update

Record: RHBA-2020:0402
CVSS 3.1: 8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Updated: 2026-11-02

OSVRHBA-2020:0675 8.6

Red Hat Bug Fix Advisory: OpenShift Container Platform 4.3.5 packages update

Record: RHBA-2020:0675
CVSS 3.1: 8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Updated: 2026-11-02

OSVBIT-jenkins-2020-2103 No score

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier exposed session identifiers on a user's detail object in the whoAmI diagnostic page.

Record: BIT-jenkins-2020-2103
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`org.jenkins-ci.main:jenkins-core` Maven	2.205 up to 2.219	2.219
`org.jenkins-ci.main:jenkins-core` Maven	before 2.204.2	2.204.2
`jenkins` Bitnami	before 2.218.1	2.218.1
`org.jenkins-ci.main:jenkins-core` Maven	2.205 up to 2.219, plus listed versions 2.2062.2072.2082.2092.210 Show 8 moreShow less 2.2112.2122.2132.2142.2152.2162.2172.218	2.219
`org.jenkins-ci.main:jenkins-core` Maven	before 2.204.2, plus listed versions 1.3961.3971.3981.3991.400 Show 45 moreShow less 1.4011.4031.4041.4051.4061.4071.4081.4091.409.11.409.21.409.31.4101.4111.4121.4131.4141.4151.4161.4171.4181.4191.4201.4211.4221.4231.4241.424.11.424.21.424.31.424.41.424.51.424.61.4251.4261.4271.4281.4291.4301.4311.4321.4331.4341.4351.4361.437	2.204.2
`atomic-enterprise-service-catalog` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 1:3.11.170-1.git.1.91db82e.el7	1:3.11.170-1.git.1.91db82e.el7
`atomic-enterprise-service-catalog-svcat` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 1:3.11.170-1.git.1.91db82e.el7	1:3.11.170-1.git.1.91db82e.el7
`atomic-openshift` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.0.00cac56.el7	0:3.11.170-1.git.0.00cac56.el7
`atomic-openshift-clients` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.0.00cac56.el7	0:3.11.170-1.git.0.00cac56.el7
`atomic-openshift-clients-redistributable` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.0.00cac56.el7	0:3.11.170-1.git.0.00cac56.el7

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Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Nuclei	Jenkins <=2.218 - Information Disclosure

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, Nuclei, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-2103 is a medium vulnerability (CVSS 5.4) in Jenkins, published January 29, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 7.04%, the 94th percentile. Fixed in org.jenkins-ci.main:jenkins-core 2.219.

References

Show 53 moreShow less

This page doesn't list everything

Left out here: 530 versions. The JSON record has them.

Package	Affected	Fixed
`atomic-openshift-cluster-autoscaler` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.0a0df6a.el7	0:3.11.170-1.git.1.0a0df6a.el7
`atomic-openshift-descheduler` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.9ad83f2.el7	0:3.11.170-1.git.1.9ad83f2.el7
`atomic-openshift-docker-excluder` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.0.00cac56.el7	0:3.11.170-1.git.0.00cac56.el7
`atomic-openshift-dockerregistry` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.55fab05.el7	0:3.11.170-1.git.1.55fab05.el7
`atomic-openshift-excluder` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.0.00cac56.el7	0:3.11.170-1.git.0.00cac56.el7
`atomic-openshift-hyperkube` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.0.00cac56.el7	0:3.11.170-1.git.0.00cac56.el7
`atomic-openshift-hypershift` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.0.00cac56.el7	0:3.11.170-1.git.0.00cac56.el7
`atomic-openshift-master` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.0.00cac56.el7	0:3.11.170-1.git.0.00cac56.el7
`atomic-openshift-metrics-server` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.357f177.el7	0:3.11.170-1.git.1.357f177.el7
`atomic-openshift-node` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.0.00cac56.el7	0:3.11.170-1.git.0.00cac56.el7
`atomic-openshift-node-problem-detector` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.b1f90a6.el7	0:3.11.170-1.git.1.b1f90a6.el7
`atomic-openshift-pod` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.0.00cac56.el7	0:3.11.170-1.git.0.00cac56.el7
`atomic-openshift-sdn-ovs` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.0.00cac56.el7	0:3.11.170-1.git.0.00cac56.el7
`atomic-openshift-service-idler` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.8328979.el7	0:3.11.170-1.git.1.8328979.el7
`atomic-openshift-template-service-broker` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.0.00cac56.el7	0:3.11.170-1.git.0.00cac56.el7
`atomic-openshift-tests` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.0.00cac56.el7	0:3.11.170-1.git.0.00cac56.el7
`atomic-openshift-web-console` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.3d64e8b.el7	0:3.11.170-1.git.1.3d64e8b.el7
`cri-o` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:1.11.16-0.5.dev.rhaos3.11.git3f89eba.el7	0:1.11.16-0.5.dev.rhaos3.11.git3f89eba.el7
`cri-o-debuginfo` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:1.11.16-0.5.dev.rhaos3.11.git3f89eba.el7	0:1.11.16-0.5.dev.rhaos3.11.git3f89eba.el7
`golang-github-openshift-oauth-proxy` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.b49be83.el7	0:3.11.170-1.git.1.b49be83.el7
`golang-github-prometheus-alertmanager` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.61d7960.el7	0:3.11.170-1.git.1.61d7960.el7
`golang-github-prometheus-node_exporter` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.51473b7.el7	0:3.11.170-1.git.1.51473b7.el7
`golang-github-prometheus-prometheus` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.227bc98.el7	0:3.11.170-1.git.1.227bc98.el7
`jenkins` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:2.204.2.1580891656-1.el7	0:2.204.2.1580891656-1.el7
`jenkins-2-plugins` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.1579107288-1.el7	0:3.11.1579107288-1.el7
`openshift-ansible` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-2.git.5.8802564.el7	0:3.11.170-2.git.5.8802564.el7
`openshift-ansible-docs` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-2.git.5.8802564.el7	0:3.11.170-2.git.5.8802564.el7
`openshift-ansible-playbooks` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-2.git.5.8802564.el7	0:3.11.170-2.git.5.8802564.el7
`openshift-ansible-roles` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-2.git.5.8802564.el7	0:3.11.170-2.git.5.8802564.el7
`openshift-ansible-test` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-2.git.5.8802564.el7	0:3.11.170-2.git.5.8802564.el7
`openshift-enterprise-autoheal` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.dfe6c52.el7	0:3.11.170-1.git.1.dfe6c52.el7
`openshift-enterprise-cluster-capacity` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.661684b.el7	0:3.11.170-1.git.1.661684b.el7
`openshift-kuryr` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.7265da1.el7	0:3.11.170-1.git.1.7265da1.el7
`openshift-kuryr-cni` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.7265da1.el7	0:3.11.170-1.git.1.7265da1.el7
`openshift-kuryr-common` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.7265da1.el7	0:3.11.170-1.git.1.7265da1.el7
`openshift-kuryr-controller` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.7265da1.el7	0:3.11.170-1.git.1.7265da1.el7
`prometheus` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.227bc98.el7	0:3.11.170-1.git.1.227bc98.el7
`prometheus-alertmanager` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.61d7960.el7	0:3.11.170-1.git.1.61d7960.el7
`prometheus-node-exporter` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.51473b7.el7	0:3.11.170-1.git.1.51473b7.el7
`python2-kuryr-kubernetes` Red Hat:openshift:3.11::el7 From an advisory covering 8 CVEs	before 0:3.11.170-1.git.1.7265da1.el7	0:3.11.170-1.git.1.7265da1.el7
`jenkins` Red Hat:openshift:4.3::el7 From an advisory covering 7 CVEs	before 0:2.204.2.1583446818-1.el7	0:2.204.2.1583446818-1.el7