CVE-2023-3550

criticalpriority · track · 0EPSS 0.014 · 72 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.38% (72nd) EPSS

CVSS 9 · critical

Is it mine?

13 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-24

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.

cvss

Technical severity, 0–10. One row per scoring source.

9.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.3–9

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:Hsecondary · NVD / NIST USexploitability 2.3 · impact 6

v3.19criticalAV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.17.3highCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:Nsecondary · ENISA EU

v3.17.3highCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:Nsecondary · help@fluidattacks.comexploitability 2.1 · impact 5.2

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USCWE-79US

affected products (13)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Open Source MediaWiki v.1.40.0all versionscert_bundDEcpe:/a:mediawiki:mediawiki:v.1.40.0
mediawiki≤ 1.40.0enisa_euvdEU
АО «НППКТ» ОСОН ОСнова Оnyx≤ 2.11fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.3fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 11fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 12fstec_bduRU
Сообщество свободного программного обеспечения MediaWiki≤ 1.40.0fstec_bduRU
debian debian linux= 10.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
debian debian linux= 11.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
mediawiki mediawiki= 1.40.0nvdUScpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*
Bitnami mediawiki1.40.0 → 1.40.1osvUSpkg:bitnami/mediawiki

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-2442MediaWiki: Schwachstelle ermöglicht Erlangen von AdministratorrechtenDeutsch2023-09-25csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in MediaWiki ausnutzen, um Administratorrechte zu erlangen.
BIT-mediawiki-2023-3550Stored XSS leads to privilege escalation in MediaWiki v1.40.02024-03-06vendor · osvUS
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.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd osv NVD CVE.org MITRE

published 2023-09-25modified 2026-06-17

references (16)

External citations — patches, advisories, analysis.

scry

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