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CVE-2026-34092· NVD / CVE Program· CNA wikimedia-foundation

Block UI elements in 'tools'-sidebar shows presence of an autoblocked IP

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Skin/Skin.Php. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.

LowCVSS 2.1 · v4.0—No exploit Fix available
Published
May 11, 2026
Updated
Jun 17, 2026
EPSS
0.3% · 23th percentile
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Report tools

JSON

Action score

8

Monitor

Low priority for now.

CVSS
8 / 40 · 2.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · wikimedia-foundation
2.1
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
mediawikimediawiki

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mediawiki mediawikibefore 1.43.7
  • mediawiki mediawiki1.44.0 and later · before 1.44.4
  • mediawiki mediawiki1.45.0 and later · before 1.45.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (wikimedia-foundation). Independent of NVD's CPE analysis and usually ahead of it.

  • Wikimedia Foundation MediaWiki

    • before 1.43.7, 1.44.4, 1.45.2affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12mediawikibefore 1:1.39.17-1+deb12u21:1.39.17-1+deb12u2
Debian:13mediawikibefore 1:1.43.8+dfsg-1~deb13u11:1.43.8+dfsg-1~deb13u1
Debian:14mediawikibefore 1:1.43.8+dfsg-11:1.43.8+dfsg-1

Same product

mediawiki: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-29904The SemanticDrilldown extension for MediaWiki through 1.37.2 (before e688bdba6434591b5dff689a45e4d53459954773) allows SQL injection with cer
    44Plan
  • CVE-2017-0372Parameters injection in SyntaxHighlight results in multiple vulnerabilities
    42Plan
  • CVE-2017-8809api.php in MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 has a Reflected File Download vulnerability.
    41Plan
  • CVE-2019-12468An Incorrect Access Control vulnerability was found in Wikimedia MediaWiki 1.27.0 through 1.32.1.
    40Plan
  • CVE-2014-9487The getid3 library in MediaWiki before 1.24.1, 1.23.8, 1.22.15 and 1.19.23 allows remote attackers to read arbitrary files, cause a denial o
    40Plan
  • CVE-2015-8009The MWOAuthDataStore::lookup_token function in Extension:OAuth for MediaWiki 1.25.x before 1.25.3, 1.24.x before 1.24.4, and before 1.23.11
    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Wikimedia Foundation MediaWiki1.43.7, 1.44.4, 1.45.2Vendor (CNA)
debian:mediawiki1:1.39.17-1+deb12u2 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-340910 days apartUser localization leaked by AbuseFilter + EventStream
    22Monitor
  • CVE-2026-5802751 days apartQueryAbuseFilter API can be used to see the hit count of private filters, which is hidden in the UI
    21Monitor
  • CVE-2026-5803351 days apart"Total number of distinct authors" statistic at action=info does not exclude revisions where the author name was deleted
    21Monitor
  • CVE-2026-340870 days apartUsers API leaks whether privileged users have their user groups disabled for lack of 2FA
    20Monitor
  • CVE-2026-5802451 days apartAPI identification of users on private wikis
    20Monitor
  • CVE-2026-5803651 days apartUsers API leaks whether privileged users have their user groups disabled for lack of 2FA
    8Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
P
Scope
X

Weakness class (CWE)

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

The bug in code

The whole CWE-200 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

json
{  "permissions": ["tabs", "<all_urls>"],  "background": { "service_worker": "analytics.js" }}

Fixed

json
{  "permissions": ["activeTab"],  "host_permissions": ["https://yildiz.example/*"]}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records