CVE-2023-3550

Public Exploit
Stored XSS leads to privilege escalation in MediaWiki v1.40.0

Description

Mediawiki v1.40.0 does not validate namespaces used in XML files. Therefore, if the instance administrator allows XML file uploads, a remote attacker with a low-privileged user account can use this exploit to become an administrator by sending a malicious link to the instance administrator.

Category

7.3
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.14%
Third-Party Advisory fluidattacks.com Third-Party Advisory debian.org Third-Party Advisory debian.org
Affected: MediaWiki MediaWiki
Published at:
Updated at:

References

Link Tags
https://fluidattacks.com/advisories/blondie/ third party advisory exploit
https://www.mediawiki.org/wiki/MediaWiki/ product
https://www.debian.org/security/2023/dsa-5520 third party advisory
https://lists.debian.org/debian-lts-announce/2023/11/msg00027.html third party advisory mailing list
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FU2FGUXXK6TMV6R52VRECLC6XCSQQISY/

Frequently Asked Questions

What is the severity of CVE-2023-3550?
CVE-2023-3550 has been scored as a high severity vulnerability.
How to fix CVE-2023-3550?
To fix CVE-2023-3550, 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-2023-3550 being actively exploited in the wild?
It is possible that CVE-2023-3550 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-3550?
CVE-2023-3550 affects MediaWiki MediaWiki.
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