How severe is CVE-2026-49871?

CVE-2026-49871 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-49871 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-49871?

CVE-2026-49871 affects Apache Apisix. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-49871?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-49871 have an EU (EUVD) identifier?

Yes. CVE-2026-49871 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38025.

When was CVE-2026-49871 published?

CVE-2026-49871 was published on 2026-06-19 and last updated on 2026-06-23.

CVE-2026-49871

CVE-2026-49871 is a critical-severity vulnerability in Apache Apisix with a CVSS 3.x base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-352.

Key facts

Severity: Critical (CVSS 3.x base score 9.3)
CVSS v4: 2.1
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38025
Weakness: CWE-352
Affected product: Apache Apisix
Published: 2026-06-19
Last modified: 2026-06-23

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.

Frequently asked questions

What is CVE-2026-49871?: 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.
How severe is CVE-2026-49871?: CVE-2026-49871 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-49871 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-49871?: CVE-2026-49871 affects Apache Apisix. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-49871?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-49871 have an EU (EUVD) identifier?: Yes. CVE-2026-49871 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38025.
When was CVE-2026-49871 published?: CVE-2026-49871 was published on 2026-06-19 and last updated on 2026-06-23.

References

Affected products (1)

cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:*

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