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CVE-2026-56451 is a critical authentication bypass vulnerability in Siemens Opcenter X affecting all versions prior to V2604. The application does not properly validate the algorithm declared in the JSON Web Token header during token verification. Because the algorithm field is attacker-controlled, the backend may accept forged tokens instead of enforcing an expected signing algorithm, enabling JWT algorithm confusion or acceptance of unsigned tokens. Successful exploitation allows a remote unauthenticated attacker to create arbitrary JWTs, bypass authentication controls, and impersonate any application user, including administrative accounts. In an industrial manufacturing execution system deployment, this can expose both business and operational workflows to unauthorized control.
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15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical JWT algorithm validation flaw in Siemens Opcenter X that allows unauthenticated attackers to forge tokens, impersonate an administrator, and gain full control of the MES application.
An authentication bypass vulnerability in Siemens Opcenter X caused by improper validation of the JWT header algorithm, allowing unauthenticated remote attackers to forge tokens and impersonate users, including administrators.
A critical JWT algorithm confusion vulnerability in Siemens Opcenter X that allows unauthenticated remote attackers to forge JWTs, bypass authentication, and gain full administrative access.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.