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CVE.org (no NVD analysis yet)· CNA VulnCheck

CVE-2026-126559: Semantic MediaWiki 4.2.0 before 7.4.1 Stored XSS via Special:FacetedSearch

MediumCVSS 4.8 · v4.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 19/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No special conditions are required; it is repeatable.
  • Fixed version: SemanticMediaWiki SemanticMediaWiki 7.4.1.

Low priority for now. Upgrade to SemanticMediaWiki SemanticMediaWiki 7.4.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Semantic MediaWiki 4.2.0 before 7.4.1 contains a stored cross-site scripting vulnerability in OptionsBuilder::profiles() that allows users with the smw-schemaedit right to inject markup. Attackers can save FACETEDSEARCH_PROFILE_SCHEMA profile keys or labels that break out of option elements, executing scripts for every Special:FacetedSearch visitor including administrators.

Published
Nov 11, 2026
Updated
Nov 12, 2026
EPSS
0.2% · 15th percentile

Report tools

JSON

Action score

19

Monitor

Low priority for now.

CVSS
19 / 40 · 4.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CNA vs NVD score

NVD
—
CNA · VulnCheck
4.8
NVD has not scored this yet; the score shown is the CNA’s.

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

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

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-126559

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

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Limit the impact of XSS

This is a cross-site scripting (XSS) vulnerability. A well-configured Content-Security-Policy doesn't fix it, but greatly reduces its impact. Check your site's CSP and other security headers for free.

Check security headers

Versions reported by the vendor

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

  • SemanticMediaWiki SemanticMediaWiki

    • 7.4.1not affected
    • 4.2.0 and later · before 7.4.1affected · semver

Same product

semanticmediawiki: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-61682Semantic MediaWiki vulnerable to stored XSS through wikitext via improper use of non-reserved data attributes
    34Monitor
  • CVE-2026-126566Semantic MediaWiki 7.3.1 before 7.4.1 Incorrect Authorization via Edit Protection Annotations
    28Monitor
  • CVE-2026-126561Semantic MediaWiki 2.5.0 before 7.4.1 Missing Authorization via Is edit protected Annotation
    28Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-77610Sep 18, 2026 · Semantic MediaWiki has a query debug output XSS (`DebugFormatter`)
    24Monitor
  • ← EarlierCVE-2026-77616Sep 18, 2026 · Semantic MediaWiki affected by reflected XSS in `Special:Ask` via a forged cursor pagination token
    24Monitor
  • Later →CVE-2026-126560Nov 11, 2026 · Semantic MediaWiki 3.0.0 before 7.4.1 Stored XSS via data-search Attributes
    20Monitor

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
SemanticMediaWiki SemanticMediaWiki7.4.1Vendor (CNA)

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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 12, 2026+2 d
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.

Credits

All researchers

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

Variant candidates

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

  • CVE-2025-6168254 days apartSemantic MediaWiki vulnerable to stored XSS through wikitext via improper use of non-reserved data attributes
    34Monitor
  • CVE-2026-7760654 days apartSemantic MediaWiki has reflected XSS in Special:Ask plain table headers
    24Monitor
  • CVE-2026-7760754 days apartSemantic MediaWiki affected by Special:Ask table `sep` parameter reflected XSS
    24Monitor
  • CVE-2026-7760854 days apartSemantic MediaWiki has reflected XSS in `Special:SearchByProperty` (`property` and `value` parameters)
    24Monitor
  • CVE-2026-7761054 days apartSemantic MediaWiki has a query debug output XSS (`DebugFormatter`)
    24Monitor
  • CVE-2026-7761654 days apartSemantic MediaWiki affected by reflected XSS in `Special:Ask` via a forged cursor pagination token
    24Monitor

Not on record for this CVE: public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

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

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

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

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

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

ATT&CK techniques

—

References

Show all references (4 more)

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

All records