CVE-2026-8857 Details.
MediaWiki EasyTimeline - Code Injection RCE
Atlas does not check this one. Needs requests that change data.
To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check.
About CVE-2026-8857. What It Means.
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 timelin…
Affected Product. What Is Hit.
- Vendor
- mediawiki
- Product
- MediaWiki EasyTimeline
FAQ
Common Questions.
MediaWiki EasyTimeline - Code Injection RCE. 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 timelin…
No. To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check. The facts about CVE-2026-8857 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-8857 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update MediaWiki EasyTimeline to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-8857. Atlas does not run a check for it, so nothing here says whether a particular site is affected.