CVE-2026-8857

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: LOW) published 2026-07-01. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 8.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.8
EG Score
8.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
80%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 9, 2026

Advisory Details (1)

Auto-updated Jul 9, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

⚓ T426631 CVE-2026-8857: Full RCE using EasyTimeline Extension

https://phabricator.wikimedia.org/T426631

Vendor Advisories for CVE-2026-8857(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 107× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 189 total refreshes for this CVE.

  1. 2026-09-01 13:54 UTCEPSS rescore
  2. 2026-09-01 04:40 UTCEPSS rescore
  3. 2026-08-30 23:35 UTCEG score recompute
  4. 2026-08-30 23:35 UTCGHSA enrichment
  5. 2026-08-30 19:18 UTCEPSS rescore
  6. 2026-08-30 11:46 UTCEG score recompute
  7. 2026-08-30 11:46 UTCGHSA enrichment
  8. 2026-08-30 01:22 UTCEPSS rescore
  9. 2026-08-28 21:42 UTCEPSS rescore
  10. 2026-08-27 22:26 UTCEG score recompute
  11. 2026-08-27 22:26 UTCGHSA enrichment
  12. 2026-08-27 14:25 UTCEPSS rescore
  13. 2026-08-26 14:47 UTCEPSS rescore
  14. 2026-08-25 16:21 UTCEG score recompute
  15. 2026-08-25 16:21 UTCGHSA enrichment
  16. 2026-08-25 13:49 UTCEPSS rescore
  17. 2026-08-24 22:56 UTCEG score recompute
  18. 2026-08-24 22:56 UTCGHSA enrichment
  19. 2026-08-24 14:18 UTCEPSS rescore
  20. 2026-08-24 10:52 UTCEG score recompute
  21. 2026-08-24 10:52 UTCGHSA enrichment
  22. 2026-08-23 19:37 UTCGHSA enrichment
  23. 2026-08-23 07:48 UTCEG score recompute
  24. 2026-08-23 07:48 UTCGHSA enrichment
  25. 2026-08-23 00:19 UTCEPSS rescore
Show 75 more
  1. 2026-08-22 19:59 UTCGHSA enrichment
  2. 2026-08-22 07:10 UTCEG score recompute
  3. 2026-08-22 07:10 UTCGHSA enrichment
  4. 2026-08-21 23:49 UTCEPSS rescore
  5. 2026-08-21 17:17 UTCGHSA enrichment
  6. 2026-08-21 04:44 UTCEG score recompute
  7. 2026-08-21 04:44 UTCGHSA enrichment
  8. 2026-08-20 22:56 UTCEPSS rescore
  9. 2026-08-20 16:55 UTCGHSA enrichment
  10. 2026-08-20 04:41 UTCEG score recompute
  11. 2026-08-20 04:41 UTCGHSA enrichment
  12. 2026-08-19 17:04 UTCEPSS rescore
  13. 2026-08-19 09:54 UTCGHSA enrichment
  14. 2026-08-18 20:59 UTCEG score recompute
  15. 2026-08-18 20:59 UTCGHSA enrichment
  16. 2026-08-18 13:49 UTCEPSS rescore
  17. 2026-08-18 13:49 UTCEPSS rescore
  18. 2026-08-18 04:50 UTCEG score recompute
  19. 2026-08-18 04:50 UTCGHSA enrichment
  20. 2026-08-17 13:47 UTCEPSS rescore
  21. 2026-08-17 12:26 UTCGHSA enrichment
  22. 2026-08-17 00:23 UTCEG score recompute
  23. 2026-08-17 00:23 UTCGHSA enrichment
  24. 2026-08-16 14:56 UTCEPSS rescore
  25. 2026-08-16 14:56 UTCEPSS rescore
  26. 2026-08-16 12:32 UTCEG score recompute
  27. 2026-08-16 12:32 UTCGHSA enrichment
  28. 2026-08-16 02:15 UTCEPSS rescore
  29. 2026-08-16 00:43 UTCGHSA enrichment
  30. 2026-08-15 12:54 UTCEG score recompute
  31. 2026-08-15 12:54 UTCGHSA enrichment
  32. 2026-08-15 01:31 UTCEPSS rescore
  33. 2026-08-15 01:01 UTCGHSA enrichment
  34. 2026-08-14 13:12 UTCGHSA enrichment
  35. 2026-08-14 01:22 UTCEG score recompute
  36. 2026-08-14 01:22 UTCGHSA enrichment
  37. 2026-08-13 22:00 UTCEPSS rescore
  38. 2026-08-13 13:33 UTCEG score recompute
  39. 2026-08-13 13:33 UTCGHSA enrichment
  40. 2026-08-13 01:43 UTCGHSA enrichment
  41. 2026-08-12 13:54 UTCEG score recompute
  42. 2026-08-12 13:54 UTCGHSA enrichment
  43. 2026-08-12 13:51 UTCEPSS rescore
  44. 2026-08-12 02:05 UTCGHSA enrichment
  45. 2026-08-11 14:15 UTCEG score recompute
  46. 2026-08-11 14:15 UTCGHSA enrichment
  47. 2026-08-11 13:43 UTCEPSS rescore
  48. 2026-08-11 02:25 UTCEG score recompute
  49. 2026-08-11 02:25 UTCGHSA enrichment
  50. 2026-08-11 00:00 UTCEPSS rescore
  51. 2026-08-10 14:36 UTCGHSA enrichment
  52. 2026-08-10 02:46 UTCGHSA enrichment
  53. 2026-08-09 14:57 UTCEG score recompute
  54. 2026-08-09 14:57 UTCGHSA enrichment
  55. 2026-08-09 13:47 UTCEPSS rescore
  56. 2026-08-09 03:08 UTCEG score recompute
  57. 2026-08-09 03:08 UTCGHSA enrichment
  58. 2026-08-08 16:37 UTCEPSS rescore
  59. 2026-08-08 15:19 UTCGHSA enrichment
  60. 2026-08-08 03:27 UTCEG score recompute
  61. 2026-08-08 03:27 UTCGHSA enrichment
  62. 2026-08-07 16:30 UTCEPSS rescore
  63. 2026-08-07 15:38 UTCGHSA enrichment
  64. 2026-08-07 03:49 UTCGHSA enrichment
  65. 2026-08-06 16:00 UTCEG score recompute
  66. 2026-08-06 16:00 UTCGHSA enrichment
  67. 2026-08-06 13:47 UTCEPSS rescore
  68. 2026-08-06 04:10 UTCEG score recompute
  69. 2026-08-06 04:10 UTCGHSA enrichment
  70. 2026-08-05 19:17 UTCEPSS rescore
  71. 2026-08-05 19:17 UTCEPSS rescore
  72. 2026-08-05 16:21 UTCGHSA enrichment
  73. 2026-08-05 02:26 UTCEG score recompute
  74. 2026-08-05 02:26 UTCGHSA enrichment
  75. 2026-08-04 15:10 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-8857.yaml
    First seen Jan 1, 2026

    MediaWiki EasyTimeline - Code Injection RCE

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8857?
CVE-2026-8857 is a high vulnerability published on July 1, 2026. 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.
When was CVE-2026-8857 disclosed?
CVE-2026-8857 was first published in the National Vulnerability Database on July 1, 2026, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8857 actively exploited?
CVE-2026-8857 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 19.6% of all scored CVEs.
What is the CVSS score of CVE-2026-8857?
CVE-2026-8857 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-8857?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8857, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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