High severity · published Jul 1, 2026
CVE-2026-8857
Full RCE using EasyTimeline Extension
8.8
CVSS
2.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.1% · higher than 82% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TI
timeline · Wikimedia Foundation
before 1.46.0, 1.45.4, 1.44.6, 1.43.9 · source: vendor
ME
Mediawiki · Mediawiki
1.43.0 before 1.43.9; 1.44.0 before 1.44.6; 1.45.0 before 1.45.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8857
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-8857
Exploit
https://phabricator.wikimedia.org/T426631
More from timeline
6.1
CVE-2026-58038
Stored XSS through javascript URLs in SVGs generated by EasyTimeline