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CVE-2026-56451

A vulnerability has been identified in Opcenter X (All versions < V2604). Affected applications do not properly validate the algorithm specified in the JSON Web Token (JWT) header. This could allow an unauthenticated remote attacker to forge arbitrary JWT, bypass authentication mechanisms and impersonate any user including administrative accounts, potentially gaining full unauthorized access to the application.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:badca85ab316b9fe0fec69a20d10b9a042ff0718663ce02bad9d9432022ab48a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"baseScore":10,"baseSeverity":"CRITICAL","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:H/SA:H","version":"4.0"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:625976bcd72a56006815094f15d89ca35882449c685f4a94237855d4da2cca99 · sha256:34b0401897c8e12a… · /containers/cna/metrics/1/cvssV4_0

{"metric":{"baseScore":10,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:625976bcd72a56006815094f15d89ca35882449c685f4a94237855d4da2cca99 · sha256:34b0401897c8e12a… · /containers/cna/metrics/0/cvssV3_1

Affected products and versions

1 source assertion
{"defaultStatus":"unknown","product":"Opcenter X","vendor":"Siemens","versions":[{"lessThan":"V2604","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:625976bcd72a56006815094f15d89ca35882449c685f4a94237855d4da2cca99 · sha256:34b0401897c8e12a… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"baseScore":10,"baseSeverity":"CRITICAL","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:H/SA:H","version":"4.0"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:625976bcd72a56006815094f15d89ca35882449c685f4a94237855d4da2cca99 · sha256:34b0401897c8e12a… · /containers/cna/metrics/1/cvssV4_0
{"metric":{"baseScore":10,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:625976bcd72a56006815094f15d89ca35882449c685f4a94237855d4da2cca99 · sha256:34b0401897c8e12a… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-347","description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:625976bcd72a56006815094f15d89ca35882449c685f4a94237855d4da2cca99 · sha256:34b0401897c8e12a… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"url":"https://cert-portal.siemens.com/productcert/html/ssa-096828.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:625976bcd72a56006815094f15d89ca35882449c685f4a94237855d4da2cca99 · sha256:34b0401897c8e12a… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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