10

CVE-2020-26276: fleetdm fleet Authentication Bypass by Spoofing

CVSS: 10.0v3.1CriticalModified
AliasesGHSA-w3wf-cfx3-6gcx
Published 17-12-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-26276 is a critical (CVSS 10.0) Authentication Bypass by Spoofing vulnerability in fleetdm fleet. EPSS estimates a 2.20% chance of exploitation in the next 30 days, higher than 82.1% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
10.0/10
010
Critical · v3.1 (CVE.org)
EPSS score
2.20%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 17-12-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

Fleet is an open source osquery manager. In Fleet before version 3.5.1, due to issues in Go's standard library XML parsing, a valid SAML response may be mutated by an attacker to modify the trusted document. This can result in allowing unverified logins from a SAML IdP. Users that configure Fleet with SSO login may be vulnerable to this issue. This issue is patched in 3.5.1. The fix was made using https://github.com/mattermost/xml-roundtrip-validator If upgrade to 3.5.1 is not possible, users should disable SSO authentication in Fleet.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

2.20%

Chance of exploitation in the next 30 days

Percentile

82%

Versus all other CVEs

30-day change

0.00 pp

From 2.20% on 19-09-2026

19-09-202619-10-2026
EPSS score
2.20%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Fleetdm1 product
Github.com/fleetdm/fleet1 product
  • v4< 3.5.1

2 vendors · 2 products

References

6 links