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CVE-2020-27846

32
FAUCET Score

CVE-2020-27846 is a critical signature verification vulnerability in the crewjam/saml library, affecting products like fedoraproject, grafana, and redhat. With a CVSS score of 9.8, this flaw allows unauthenticated attackers to bypass SAML authentication, leading to high impacts on confidentiality, integrity, and availability. While no active exploitation, public exploit code, or significant community discussion has been observed, its critical nature warrants immediate attention.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.7.5CPE matchmatch criteria
cpe:2.3:a:grafana:grafana:*:*:*:*:enterprise:*:*:*
>= 7.0.0, < 7.2.3CPE matchmatch criteria
cpe:2.3:a:grafana:grafana:*:*:*:*:enterprise:*:*:*
>= 7.3.0, < 7.3.6CPE matchmatch criteria
cpe:2.3:a:grafana:grafana:*:*:*:*:enterprise:*:*:*
< 0.4.3CPE matchmatch criteria
cpe:2.3:a:saml_project:saml:*:*:*:*:*:*:*:*
3.11CPE matchmatch criteria
cpe:2.3:a:redhat:openshift_container_platform:3.11:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.87%
Probability of exploitation in next 30 days
EPSS Percentile
91.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0487 is in the 85th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

gopatch availablevia ghsa
Product: github.com/crewjam/samlFixed in: 0.4.3
redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: grafana-0:7.3.6-2.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 4.7Fixed in: openshift4/ose-grafana:v4.7.0-202102130115.p0
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: openshift3/grafana
redhatno patchvia redhat_api
Product: OpenShift Service Mesh 2.0Fixed in: servicemesh-grafana

Vendor Advisories (2)

goGHSA-4hq8-gmxx-h6w9critical

XML Processing error in github.com/crewjam/saml

Jun 23, 2021
redhatCVE-2020-27846Critical

crewjam/saml: authentication bypass in saml authentication

Dec 17, 2020

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
github.com / crewjam/saml/security/advisories/GHSA-4hq8-gmxx-h6w9
Third Party Advisory
grafana.com / blog/2020/12/17/grafana-6.7.5-7.2.3-and-7.3.6-released-with-important-security-fix-for-grafana-enterprise
Vendor Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/3YUTKIRWT6TWU7DS6GF3EOANVQBFQZYI
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/ICP3YRY2VUCNCF2VFUSK77ZMRIC77FEM
mattermost.com / blog/coordinated-disclosure-go-xml-vulnerabilities
ExploitThird Party Advisory
security.netapp.com / advisory/ntap-20210205-0002
Third Party Advisory