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Fencer Intel
medium 4.8

CVE-2021-23365 json

Authentication Bypass

published 5y ago modified 4mo ago also GHSA-599h-8wpj-75xj , GO-2022-0906 , EUVD-2021-1267

cvss
4.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

The package github.com/tyktechnologies/tyk-identity-broker before 1.1.1 are vulnerable to Authentication Bypass via the Go XML parser which can cause SAML authentication bypass. This is because the XML parser doesn’t guarantee integrity in the XML round-trip (encoding/decoding XML data).

Patch / fix

  • go github.com/tyktechnologies/tyk-identity-broker 1.1.1
  • go github.com/TykTechnologies/tyk-identity-broker 1.1.1
  • n/a github.com/TykTechnologies/tyk-identity-broker 1.1.1

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Exploit prediction

1.01% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 5.5 AV:N/AC:L/Au:S/C:P/I:P/A:N
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/tyktechnologies/tyk-identity-broker
<1.1.1
1.1.1
go github.com/TykTechnologies/tyk-identity-broker
<1.1.1
1.1.1

Affected products

  • n/a github.com/TykTechnologies/tyk-identity-broker

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.