8.8

CVE-2026-8857: mediawiki Code Injection

CVSS: 8.8v3.1HighAnalyzed
Published 01-07-2026Last modified 01-07-2026
Open JSON

Vulnerability summary

CVE-2026-8857 is a high (CVSS 8.8) Code Injection vulnerability in mediawiki. EPSS estimates a 2.10% chance of exploitation in the next 30 days, higher than 81.4% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
46/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
2.10%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 01-07-2026
    PublishedVulnerability first disclosed.
  2. 01-07-2026
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

2.10%

Chance of exploitation in the next 30 days

Percentile

81%

Versus all other CVEs

30-day change

0.00 pp

From 2.10% on 20-09-2026

20-09-202620-10-2026
EPSS score
2.10%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (phabricator.wikimedia.org)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Mediawiki1 product
  • mediawiki≥ 1.43.0, < 1.43.9 | ≥ 1.44.0, < 1.44.6 | ≥ 1.45.0, < 1.45.4
Wikimedia foundation1 product
  • timeline< 1.46.0, 1.45.4, 1.44.6, 1.43.9

2 vendors · 2 products

References

1 links