CVE-2026-31923

Description

Cleartext Transmission of Sensitive Information vulnerability in Apache APISIX. This can occur due to `ssl_verify` in openid-connect plugin configuration being set to false by default. This issue affects Apache APISIX: from 0.7 through 3.15.0. Users are recommended to upgrade to version 3.16.0, which fixes the issue.

CVSS Details

CVSS Score

7.5

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Configurations (Affected Products)

cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:* - VULNERABLE

Apache APISIX < 3.16.0

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

# Vulnerable Configuration PoC for CVE-2026-31923
# This demonstrates the default insecure setting in Apache APISIX

plugins:
  - name: openid-connect
    config:
      # ISSUE: ssl_verify defaults to false
      # This allows Man-in-the-Middle (MITM) attacks
      ssl_verify: false
      client_id: "example_client_id"
      client_secret: "example_client_secret"
      discovery: "https://idp.example.com/.well-known/openid-configuration"
      scope: "openid profile email"

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-31923
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-31923
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-31923/
[4] VulDB https://vuldb.com/cve/CVE-2026-31923
[5] https://lists.apache.org/thread/0pjs72l7qj83j3srw1l1toyj24bsgkds
[6] http://www.openwall.com/lists/oss-security/2026/04/14/1

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-31923", "sourceIdentifier": "[email protected]", "published": "2026-04-14T09:16:35.817", "lastModified": "2026-04-17T18:39:45.377", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Cleartext Transmission of Sensitive Information vulnerability in Apache APISIX.\n\nThis can occur due to `ssl_verify` in openid-connect plugin configuration being set to false by default.\nThis issue affects Apache APISIX: from 0.7 through 3.15.0.\n\nUsers are recommended to upgrade to version 3.16.0, which fixes the issue."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-319"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:*", "versionStartIncluding": "0.7", "versionEndExcluding": "3.16.0", "matchCriteriaId": "F19DAF25-CF86-4E21-982B-58AF88C3EF65"}]}]}], "references": [{"url": "https://lists.apache.org/thread/0pjs72l7qj83j3srw1l1toyj24bsgkds", "source": "[email protected]", "tags": ["Mailing List", "Vendor Advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/14/1", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"]}]}}