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CVE-2020-35474

20
FAUCET Score

CVE-2020-35474 describes a cross-site scripting (XSS) vulnerability in MediaWiki versions prior to 1.35.1, specifically affecting Fedora and MediaWiki products. This medium-severity vulnerability (CVSS 6.1) arises from the improper handling of user-controlled input within the MediaWiki:recentchanges-legend-watchlistexpiry definition, allowing for the injection of raw HTML. Successful exploitation requires user interaction (UI:R) and could lead to low impact on confidentiality and integrity (C:L/I:L). Currently, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.35.1CPE matchmatch criteria
cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*
33CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.04%
Probability of exploitation in next 30 days
EPSS Percentile
60.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0104 is in the 73rd percentile among its peer group of 26,236 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

redhatend of lifevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: mediawiki

Vendor Advisories (1)

redhatCVE-2020-35474Moderate

mediawiki: message recentchanges-legend-watchlistexpiry can contain raw html

Dec 18, 2020

References

lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC
lists.wikimedia.org / pipermail/mediawiki-announce/2020-December/000268.html
Mailing ListRelease NotesVendor Advisory
phabricator.wikimedia.org / T268894
ExploitThird Party Advisory