CVE-2026-116891

SemanticMediaWiki 4.2.0 before 7.2.1 Reflected XSS via Special:FacetedSearch cstate

publishedCWE-79

SemanticMediaWiki from 4.2.0 before 7.2.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject HTML via unescaped cstate parameters in Special:FacetedSearch. Attackers can craft URLs with q, a matching crc32 csum or filtered=1, and cstate values that break out of hidden input attributes to execute script in victims' browsers.

Technical severity5.1 mediumCVSS 4.0 · CNA: VulnCheck

Published2026-10-27Source updated 2026-11-04

Collected2026-11-044 attributed sources

Fixes and workarounds

Fix

mediawiki/semantic-media-wiki (Packagist): OSV reports a fixed version 7.2.1. Check the advisory for supported release branches.

Source: OSV GHSA-9rcc-pmj8-ffhr

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
SemanticMediaWiki SemanticMediaWiki	≥ 4.2.0; < 7.2.1 (affected, semver) 7.2.1 (unaffected, semver) Other versions: unaffected	CNA: VulnCheck
mediawiki/semantic-media-wiki `mediawiki/semantic-media-wiki` Packagist	4.2.0 (affected, Packagist) 5.0.0 (affected, Packagist) 5.0.1 (affected, Packagist) 5.0.2 (affected, Packagist) 5.1.0 (affected, Packagist) 6.0.0 (affected, Packagist) 6.0.1 (affected, Packagist) 7.0.0 (affected, Packagist) 7.1.0 (affected, Packagist) 7.2.0 (affected, Packagist) Ecosystem version events: introduced 4.2.0; fixed 7.2.1 Source events (ECOSYSTEM) `[ { "introduced": "4.2.0" }, { "fixed": "7.2.1" } ]` Other versions: unaffected	OSV GHSA-9rcc-pmj8-ffhr

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

NVD applicability configurations (1)

These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.

[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:semantic-mediawiki:semantic_mediawiki:*:*:*:*:*:mediawiki:*:*",
            "versionEndExcluding": "7.2.1",
            "versionStartIncluding": "4.2.0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
4.0 / 5.1 medium	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`	CNA: VulnCheck
3.1 / 6.1 medium	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`	CNA: VulnCheck
4.0 / 5.1 medium	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/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: [email protected]
3.1 / 6.1 medium	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`	NVD: [email protected]

Exploit evidence

https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-9rcc-pmj8-ffhr
exploit · ADP: CISA-ADP
https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-9rcc-pmj8-ffhr
exploit · [email protected]
https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-9rcc-pmj8-ffhr
exploit · 134c704f-9b21-4f2e-91b3-4a467353bcc0

References

https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-9rcc-pmj8-ffhrCNA: VulnCheck · vendor-advisory
https://www.vulncheck.com/advisories/semanticmediawiki-4.2.0-before-7.2.1-reflected-xss-via-special-facetedsearch-cstateCNA: VulnCheck · third-party-advisory
https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-9rcc-pmj8-ffhrADP: CISA-ADP · exploit
https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-9rcc-pmj8-ffhr[email protected] · Exploit, Mitigation, Vendor Advisory
https://www.vulncheck.com/advisories/semanticmediawiki-4.2.0-before-7.2.1-reflected-xss-via-special-facetedsearch-cstate[email protected] · Third Party Advisory
https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-9rcc-pmj8-ffhr134c704f-9b21-4f2e-91b3-4a467353bcc0 · Exploit, Mitigation, Vendor Advisory
https://github.com/advisories/GHSA-9rcc-pmj8-ffhrOSV / GitHub Security Advisories · advisory
https://osv.dev/vulnerability/GHSA-9rcc-pmj8-ffhrOSV / GitHub Security Advisories · osv

Prioritization

CISA known exploited vulnerabilities

No KEV listing in collected sources. This does not establish that exploitation is absent.

EPSS

0.17% estimated probability of exploitation in the next 30 days; percentile 6.90.
Assessed 2026-11-04 by FIRST.

SSVC

Exploitation: poc
Automatable: no
Technical impact: partial

ADP: CISA-ADP · 2026-11-04

Provenance

CNA: VulnCheck
Source updated 2026-11-04
Retrieved 2026-11-04

NVD
Source updated 2026-11-04
Retrieved 2026-11-04

OSV / GitHub Security Advisories
Source updated 2026-10-28
Retrieved 2026-11-04

FIRST EPSS
Source updated Not reported
Retrieved 2026-11-04

Disclosure revision
07c54617a08b2bb2f9ed44e65cd5efca70d560af164e72e46664bb0442194e3d

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