CVE-2017-8809

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-17. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 8%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

api.php in MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 has a Reflected File Download vulnerability.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
65(Track*)
EG Risk 65/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
8%
EPSS %ILE
94%
KEV
Not listed

Published

November 15, 2017

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Aug 24, 2026
No patch confirmed yet.
generic

[SECURITY] [DSA 4036-1] mediawiki security update

https://www.debian.org/security/2017/dsa-4036
generic

[MediaWiki-announce] Security release: 1.29.2 / 1.28.3 / 1.27.4 - MediaWiki-announce - lists.wikimedia.org

https://lists.wikimedia.org/pipermail/mediawiki-announce/2017-November/000216.html
generic
http://www.securitytracker.com/id/1039812

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
mediawiki—1:1.27.4-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
mediawiki—1:1.27.4-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
mediawiki—1:1.27.4-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
mediawiki—1:1.27.4-1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
mediawiki1:1.27.3-1, 1:1.27.4-1~bpo8+11:1.27.4-1~deb9u1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 24× 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 155 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCmotikan2010/CVE-2017-8809_MediaWiki_RFD
    First seen Jan 22, 2020

    CVE-2017-8809 Docker - RFD(Reflected File Download) for MediaWiki

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2017-8809?
CVE-2017-8809 is a critical vulnerability published on November 15, 2017. api.php in MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 has a Reflected File Download vulnerability.
When was CVE-2017-8809 disclosed?
CVE-2017-8809 was first published in the National Vulnerability Database on November 15, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-8809 actively exploited?
CVE-2017-8809 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 8% probability of exploitation in the next 30 days, which ranks it in the top 5.8% of all scored CVEs.
What is the CVSS score of CVE-2017-8809?
CVE-2017-8809 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-8809?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-8809, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2017-8809

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