CVE-2020-35477

Public Exploit

Description

MediaWiki before 1.35.1 blocks legitimate attempts to hide log entries in some situations. If one sets MediaWiki:Mainpage to Special:MyLanguage/Main Page, visits a log entry on Special:Log, and toggles the "Change visibility of selected log entries" checkbox (or a tags checkbox) next to it, there is a redirection to the main page's action=historysubmit (instead of the desired behavior in which a revision-deletion form appears).

Category

5.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.55%
Vendor Advisory debian.org Vendor Advisory fedoraproject.org Vendor Advisory wikimedia.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://phabricator.wikimedia.org/T205908 issue tracking exploit third party advisory
https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html mailing list release notes vendor advisory
https://www.debian.org/security/2020/dsa-4816 third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2020/12/msg00034.html third party advisory mailing list
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-35477?
CVE-2020-35477 has been scored as a medium severity vulnerability.
How to fix CVE-2020-35477?
To fix CVE-2020-35477, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-35477 being actively exploited in the wild?
It is possible that CVE-2020-35477 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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