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Jenkins 2.567 and earlier, and Jenkins LTS 2.555.2 and earlier, contain an open redirect vulnerability in the post-login redirect handling. The login flow improperly determines whether a redirect URL points to Jenkins when the URL contains tab or newline characters between //. Because these characters are not correctly accounted for during validation, an attacker can craft a redirect target that bypasses the safety check yet is interpreted by the browser as a scheme-relative external URL, causing the user to be redirected to an attacker-controlled domain after authentication.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Jenkins open redirect vulnerability in the login flow where crafted path segments or control characters bypass redirect validation.
An open-redirect vulnerability in Jenkins resolved in the same advisory as CVE-2026-53435.
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.