CVE-2017-8809

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.

Published: 2017-11-15 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-8809 is rated High Risk (67/100): CVSS Critical severity, with high exploitation likelihood (EPSS 7.71%, 94th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-8809

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 18.08% 7.71% -10.37%
2 2026-03-04 15.82% 18.08% +2.26%
3 2026-03-01 — 15.82% —

Full EPSS history (48 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-8809

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2017-8809

OS Trackers for CVE-2017-8809

vendor priority summary link
debian not yet assigned CVE-2017-8809 not yet assigned priority: Debian including 1 source packages (mediawiki), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-8809
ubuntu medium CVE-2017-8809 medium priority: Ubuntu including 1 source packages (mediawiki), 8 status rows across 8 suites (artful, bionic, cosmic, disco, trusty, upstream, xenial, zesty): not-affected 3, DNE 2, ignored 2, released 1. https://ubuntu.com/security/CVE-2017-8809

Affected software / configurations for CVE-2017-8809

Vendor Product Version Raw CPE
mediawiki mediawiki <= 1.27.3 cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*
mediawiki mediawiki 1.28.0 cpe:2.3:a:mediawiki:mediawiki:1.28.0:*:*:*:*:*:*:*
mediawiki mediawiki 1.28.1 cpe:2.3:a:mediawiki:mediawiki:1.28.1:*:*:*:*:*:*:*
mediawiki mediawiki 1.28.2 cpe:2.3:a:mediawiki:mediawiki:1.28.2:*:*:*:*:*:*:*
mediawiki mediawiki 1.29.0 cpe:2.3:a:mediawiki:mediawiki:1.29.0:*:*:*:*:*:*:*
mediawiki mediawiki 1.29.1 cpe:2.3:a:mediawiki:mediawiki:1.29.1:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

References for CVE-2017-8809

cvelogic Threat Intelligence