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CVE-2026-52824 is a critical vulnerability in Kimai affecting versions up to and including 2.57.0. The flaw is caused by use of a publicly known insecure default value for APP_SECRET, particularly in the official Docker image, and potentially in deployments that retained the shipped default configuration. Kimai relies on APP_SECRET as Symfony’s kernel secret to generate and validate HMAC-signed security-sensitive artifacts, including remember-me cookies, login links, password reset URLs, and CSRF tokens. Because the default secret was predictable and not automatically replaced during initialization, an unauthenticated attacker who knows or can determine target account details can forge trusted authentication material and bypass normal authentication controls. This can result in account takeover, including privileged accounts, on vulnerable instances.
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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.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical authentication bypass/account takeover vulnerability in Kimai’s official Docker image caused by an insecure default APP_SECRET value, allowing remote unauthenticated attackers to forge trusted security tokens and cookies.
A critical authentication/account takeover vulnerability in Kimai caused by a publicly known default APP_SECRET in the official Docker image, enabling forged signed cookies and account hijacking.
An authentication bypass vulnerability affecting Kimai versions 2.57.0 and earlier, apparently related to use of a default APP_SECRET.
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.