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CVE-2018-1000861 is a remote code execution vulnerability in the Stapler web framework used by Jenkins. It affects Jenkins 2.153 and earlier and Jenkins LTS 2.138.3 and earlier. The flaw is located in MetaClass.java within Stapler and allows crafted HTTP request URLs to reach and invoke methods on Java objects that were not intended to be externally invocable through the web interface. By exposing unintended method invocation paths through URL handling, the vulnerability can be abused to trigger code execution in the Jenkins process context.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Jenkins vulnerability included among WatchBog’s exploit modules for spreading and remote code execution.
A Jenkins remote code execution vulnerability that the Rocke Group malware uses to execute code on vulnerable Jenkins instances.
A Jenkins remote code execution vulnerability listed among the exploits used by Sysrv.
A remote code execution vulnerability in the Jenkins Stapler Web Framework mentioned only as an IPS protection entry.
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.