# CVE-2026-8857: Full RCE using EasyTimeline Extension

- Exploited (CISA KEV): no
- Published: 2026-07-01
- CVSS: 0 NONE (v4.0)
- EPSS: 2.1% (82th percentile)
- CWE: CWE-94

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.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | No public claim | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | No public claim | — | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

## Our test (measured)

- OWASP Core Rule Set 4.25.0, paranoia level 1, anomaly threshold 5, default CRS settings: passed (0 of 4 requests blocked), template CVE-2026-8857, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: partial (1 of 4 requests blocked), template CVE-2026-8857, 2026-11-02

## Social

3 posts seen since 2026-11-02.

- x 2026-11-02: New this week in our initial access community feed: detections + exploits for CVE-2026-8857 (MediaWiki EasyTimeline RCE) and CVE-2026-92122 (Jenkins Script Security Plugin sandbox bypass RCE). https://t.co/Opxy6peUP4 (https://x.com/zeroSteiner/status/2117371356505424009)
- bluesky 2026-11-02: New this week in our initial access community feed: detections + exploits for CVE-2026-8857 (MediaWiki EasyTimeline RCE) and CVE-2026-92122 (Jenkins Script Security Plugin sandbox bypass RCE). github.com/vulncheck-os... (https://bsky.app/profile/zerosteiner.bsky.social/post/3mzebzwdwab27)
- x 2026-11-02: Initial Access Community Monday release! Two new exploits: CVE-2026-92122, a Jenkins Groovy sandbox escape, and CVE-2026-8857, a MediaWiki command injection. Both include Docker labs, PCAPs, detection rules, and ASM queries.  https://t.co/2Ro1B8vrUb (https://x.com/Junior_Baines/status/2117371016309604443)

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2026-8857 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2026-8857