CVE-2026-102508 (GCVE-0-2026-102508)

Vulnerability from cvelistv5 – Published: 2026-09-30 07:42 – Updated: 2026-09-30 14:39
VLAI
Title
Apache PLC4X: OPC UA secure channel: integrity bypass, unverifiable server certificate, and silent downgrade
Summary
Improper Verification of Cryptographic Signature and Improper Certificate Validation in the OPC UA driver of Apache PLC4X (PLC4J) allows an attacker in a network position between client and server to impersonate the OPC UA server and to read, forge or modify secure-channel traffic, including user credential ssent by the client. The defect manifests differently depending on the version: - In 0.9.0 through 0.11.0 a failed message-signature check is only logged and never enforced, and there is no mechanism to verify the server certificate: it is taken from the unauthenticated GetEndpoints discovery response and used to encrypt the user's password. - In 0.12.0 through 0.13.1 the signature check is inverted (valid signatures are rejected, invalid ones accepted), and server certificates are accepted without a trust anchor by default. - In all affected versions the default security policy is None. Starting with 0.12.0 the driver additionally continues silently at a weaker security policy than the one configured, and starting with 0.13.0 endpoint selection prefers the weakest matching endpoint. Users checking only for one of these mechanisms may wrongly conclude they are unaffected. This issue affects Apache PLC4X: from 0.9.0 before 1.0.0. Users are recommended to upgrade to version 1.0.0, which fixes the issue. Version 1.0.0 verifies message signatures correctly, refuses to connect unless the server certificate can be verified against a configured trust store or pinned certificate, defaults to Basic256Sha256 with SignAndEncrypt, and fails the connection if the negotiated security policy is weaker than the configured one.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 14:39 UTC
CWE
  • CWE-347 - Improper verification of cryptographic signature
  • CWE-295 - Improper Certificate Validation
  • CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Impacted products
Vendor Product Version CPE status
Apache Software Foundation Apache PLC4X Affected: 0.9.0 , < 1.0.0 (semver)
Unaffected: 1.0.0 (semver)
guessed Create a notification for this product.
Show details on NVD website

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          "providerMetadata": {
            "dateUpdated": "2026-09-30T07:42:43.537Z",
            "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
            "shortName": "apache"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://lists.apache.org/thread.html/o076mcnsx6wnqpdy780m7s6hddbbnjfw"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "timeline": [
            {
              "lang": "en",
              "time": "2026-07-09T11:54:00.000Z",
              "value": "reported to the Apache Security Team"
            },
            {
              "lang": "en",
              "time": "2026-07-10T11:55:00.000Z",
              "value": "fixed on develop (a2dbb6bfc0, 5a4d5bdb4c)"
            },
            {
              "lang": "en",
              "time": "2026-09-07T11:56:00.000Z",
              "value": "Apache PLC4X 1.0.0 released with the fix"
            }
          ],
          "title": "Apache PLC4X: OPC UA secure channel: integrity bypass, unverifiable server certificate, and silent downgrade",
          "x_generator": {
            "engine": "Vulnogram 1.0.3"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "assignerShortName": "apache",
        "cveId": "CVE-2026-102508",
        "datePublished": "2026-09-30T07:42:43.537Z",
        "dateReserved": "2026-09-29T11:40:54.414Z",
        "dateUpdated": "2026-09-30T14:39:33.687Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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