CVE-2026-8857 PoC — Full RCE using EasyTimeline Extension

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-8857.yaml

Associated Vulnerability

Title:Full RCE using EasyTimeline Extension (CVE-2026-8857)
Description:A vulnerability in Wikimedia Foundation timeline. This vulnerability is associated with program files scripts/EasyTimeline.Pl, includes/Timeline.Php. This issue affects timeline: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.

Description

MediaWiki EasyTimeline (Timeline) extension versions before 1.46.0, 1.45.4, 1.44.6, and 1.43.9 contain a code injection vulnerability caused by insufficient neutralization of newlines in TextData text attributes in EasyTimeline.pl / Timeline.php. A crafted <timeline> block can inject ploticus '#proc getdata' and 'command:' directives, which execute via /bin/sh because EasyTimeline invokes ploticus without the -noshell flag. Exploitation requires the ability to submit timeline markup for rendering — low-privileged edit access, or anonymous access on wikis that allow anonymous editing and API use. This template's parse-based check needs API read access; optional username/password inputs can be supplied for private wikis that deny anonymous read.

File Snapshot

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