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Vulnerability details: VCID-z4gr-zsn8-cfcz
Vulnerability ID VCID-z4gr-zsn8-cfcz
Aliases CVE-2021-44855
Summary An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. There is Blind Stored XSS via a URL to the Upload Image feature.
Status Published
Exploitability 0.5
Weighted Severity 4.9
Risk 2.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
System Score Found at
cvssv3 3.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-44855.json
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00276 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00284 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00315 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00315 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00315 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
epss 0.00315 https://api.first.org/data/v1/epss?cve=CVE-2021-44855
cvssv3.1 5.4 https://nvd.nist.gov/vuln/detail/CVE-2021-44855
cvssv3.1 5.4 https://phabricator.wikimedia.org/T293589
ssvc Track https://phabricator.wikimedia.org/T293589
archlinux Unknown https://security.archlinux.org/AVG-2823
cvssv3.1 5.4 https://security.gentoo.org/glsa/202305-24
ssvc Track https://security.gentoo.org/glsa/202305-24
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-44855.json
https://api.first.org/data/v1/epss?cve=CVE-2021-44855
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44854
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44855
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44856
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28201
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28202
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28203
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-29248
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-31042
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-31043
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-31090
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-31091
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-34911
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-34912
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41765
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41767
https://security.gentoo.org/glsa/202305-24
2156318 https://bugzilla.redhat.com/show_bug.cgi?id=2156318
AVG-2823 https://security.archlinux.org/AVG-2823
cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.37.0:-:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mediawiki:mediawiki:1.37.0:-:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.37.0:rc0:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mediawiki:mediawiki:1.37.0:rc0:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.37.0:rc1:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mediawiki:mediawiki:1.37.0:rc1:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.37.0:rc2:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mediawiki:mediawiki:1.37.0:rc2:*:*:*:*:*:*
CVE-2021-44855 https://nvd.nist.gov/vuln/detail/CVE-2021-44855
T293589 https://phabricator.wikimedia.org/T293589
No exploits are available.
Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-44855.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-44855
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://phabricator.wikimedia.org/T293589
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-14T15:51:07Z/ Found at https://phabricator.wikimedia.org/T293589
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://security.gentoo.org/glsa/202305-24
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-14T15:51:07Z/ Found at https://security.gentoo.org/glsa/202305-24
Exploit Prediction Scoring System (EPSS)
Percentile 0.50768
EPSS Score 0.00276
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T09:45:55.530059+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2021/44xxx/CVE-2021-44855.json 37.0.0