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CVE-2026-49871

Apache Apisix cross-site request forgery (CSRF)

9.3 CRITICALEPSS 0.35%
  1. Published19 Jun 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Affected products

Apache Apisix≥ 3.0.0 < 3.17.0

Remediation

Fixed in
Apache Apisix≥ 3.17.0

References

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Frequently asked

Is CVE-2026-49871 being actively exploited?

CVE-2026-49871 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.35%.

How severe is CVE-2026-49871?

CVE-2026-49871 has a CVSS 3.1 base score of 9.3, rated critical. EPSS estimates a 0.35% probability of exploitation.

Which products are affected by CVE-2026-49871?

Affected products include Apache Apisix.

How do I fix CVE-2026-49871?

Upgrade affected software to a fixed version, for example Apache Apisix 3.17.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-49871 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.