CVE-2026-49871 PUBLISHED

Apache APISIX: cas-auth login CSRF / session injection issue

Assigner: apache
Reserved: 02.06.2026 Published: 19.06.2026 Updated: 19.06.2026

Cross-Site Request Forgery (CSRF) vulnerability in the cas-auth plugin under default configurations.

This defect allows a remote attacker that manages to send a victim to a webpage controlled by them can cause the victim's browser to become authenticated as a different identity.

Actions the victim takes upstream are then attributed to attackers identity.

This issue affects Apache APISIX: from 3.0.0 through 3.16.0.

Users are recommended to upgrade to version 3.17.0, which fixes the issue.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CVSS Score: 2.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	Low
Attack Complexity	Low	Integrity	None	Integrity	Low
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	Active

CVSS 4.0

Product Status

Vendor	Apache Software Foundation
Product	Apache APISIX
Versions	Default: unaffected affected from 3.0.0 to 3.16.0 (incl.)

Credits

lokerxxx reporter

References

https://lists.apache.org/thread/1ozsnss0lof4gpwq763d66oxwxt3sycp

Problem Types

CWE-352 Cross-Site Request Forgery (CSRF) CWE