CVE-2026-49872: Improper Authentication vulnerability in Apache APISIX. When the cas-auth plugin is used in a route, an attac

This month

HIGH 8.1WATCHLISTUPGRADE

CVE-2026-49872 is a high-severity flaw (CVSS 8.1) affecting apisix. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Authentication vulnerability in Apache APISIX. When the cas-auth plugin is used in a route, an attacker can possibly authenticate itself with credentials from a different source. 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.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-287
Published	2026-06-19
Last modified	2026-10-26

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-19 14:16 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

apache apisix UPGRADE

Affected: >= 3.0.0 and < 3.17.0

Fixed in: 3.17.0

Safe to downgrade to: a release before 3.0.0

1. Check installed version

apt-cache policy apisix || rpm -q apisix || apisix --version

2. UPGRADE to 3.17.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade apisix

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade apisix

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison apisix sudo apt install apisix=<VERSION_BEFORE_3.0.0> sudo apt-mark hold apisix

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list apisix sudo dnf downgrade apisix-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add apisix

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-49872?

apisix: upgrade to 3.17.0. Exact commands for each OS are on this page.

Is CVE-2026-49872 being exploited?

CVE-2026-49872 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-49872 affect?

CVE-2026-49872 affects apisix. Severity is high (CVSS 8.1). Improper Authentication vulnerability in Apache APISIX. When the cas-auth plugin is used in a route, an attacker can possibly authenticate itself with credentials from a different source. This issue affects Apache APISIX: from 3.0.0 throug

How urgent is CVE-2026-49872?

Priority 44/100. High severity; On your watchlist

Software pages

Apache APISIX vulnerabilities

Related CVEs

CVE-2026-39998 HIGH 8.8 UPGRADE Improper Input Validation vulnerability in Apache APISIX. The attacker can take advantage of certain configur
CVE-2026-48895 HIGH 7.2 UPGRADE URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Apache APISIX. The attacker could manipu
CVE-2026-44087 CRITICAL 9.1 UPGRADE Insufficient Verification of Data Authenticity vulnerability in Apache APISIX. The openid-connect plugin unde
CVE-2026-47341 MEDIUM 6.5 UPGRADE Authentication Bypass by Capture-replay vulnerability in Apache APISIX. Attacker can benefit from certain con
CVE-2026-49871 CRITICAL 9.3 UPGRADE Cross-Site Request Forgery (CSRF) vulnerability in the cas-auth plugin under default configurations. This def

References

← Back to latest CVEs