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CVE-2026-56451 is a critical authentication bypass vulnerability affecting Siemens Opcenter X versions earlier than V2604. The flaw is caused by improper validation of the algorithm specified in the JSON Web Token (JWT) header during token verification. Because the application does not correctly enforce or verify the expected JWT signing algorithm, an unauthenticated remote attacker can forge arbitrary JWTs that are accepted as valid by the application. Successful exploitation allows the attacker to bypass authentication controls and impersonate arbitrary users, including administrative accounts, resulting in unauthorized access to application functionality and data.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.