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Vulnerabilities

Security incident · CVE-2026-116891

Semantic MediaWiki's Special:FacetedSearch cstate hidden inputs enable reflected XSS (residual of CVE-2025-10354)

Published Sep 18, 2026 · catalog updated Oct 28, 2026 · Semantic MediaWiki's Special:FacetedSearch cstate

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-116891. EPSS is 0.17%. Act only if a listed version of Semantic MediaWiki's Special:FacetedSearch cstate is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Semantic MediaWiki's Special:FacetedSearch cstate).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.17%
Remediation
Advisory link
Affected products
Packagist mediawiki/semantic-media-wiki

### Summary Special:FacetedSearch hidden inputs enable reflected XSS (residual of CVE-2025-10354) ### Details #### Affected versions and vulnerable location - Confirmed present on latest shipped release tag available in the local clone: . - Confirmed present on default branch at HEAD . Vulnerable sink (default-branch representation): - - Builds by concatenating unescaped request-controlled values into an HTML attribute context ( ). - - Inserts the constructed fragment via (no HTML escaping at this boundary). #### Reachability trace (verified from source) 1. HTTP entrypoint: - to dispatches into . 2. Request decoding boundary: - constructs from and calls . 3. Checksum gate: - clears only when and . 4. Decoder -> HTML assembly: - iterates and concatenates each into without escaping. - passes into the template variable . 5. HTML injection sink: - renders into the , so the concatenated markup is inserted as raw HTML. ### PoC #### Reproduction steps (source-derived) 1. Choose a value. 2. Compute as . 3. Send a request that includes: - - - at least one entry Example request shape: ### Impact #### Attacker model - Any remote attacker who can send HTTP requests to (or the localized alias mapped to the same class) can supply attacker-controlled query parameters. - Preconditions: - The attacker must make survive , either by setting to (when ), or by setting . - The attacker must supply values containing characters that break out of the HTML attribute context (for example an injected to terminate the attribute value). #### Severity and CVSS reasoning Proposed severity: MEDIUM. Proposed CVSS v3.1 vector: . Rationale: - AV:N: delivered over the network via query parameters. - AC:L: requires only setting , , and at least one entry. - PR:N: no authentication required for the request path in this code. - UI:R: the victim must load the crafted URL. - S:C: reflected XSS executes in the wiki origin and can affect other users depending on deployment and browser behavior. ### Why this i

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Packagist mediawiki/semantic-media-wiki4.2.0 → 7.2.1

How to fix CVE-2026-116891

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-116891. EPSS is 0.17%. Act only if a listed version of Semantic MediaWiki's Special:FacetedSearch cstate is installed.

Which versions are affected?

Compare what you have installed with 4.2.0 → 7.2.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.17%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 18, 2026 · GitHub Advisory Database

    Detected

    ### Summary Special:FacetedSearch hidden inputs enable reflected XSS (residual of CVE-2025-10354) ### Details #### Affected versions and vulnerable location - Confirmed present on latest shipped release tag available in the local clone: . - Confirmed present on default branch at HEAD . Vulnerable sink (default-branch representation): - - Builds by concatenating unescaped request-controlled values

  2. Oct 28, 2026 · GitHub Advisory Database

    Fix available

    mediawiki/semantic-media-wiki fixed in 7.2.1

  3. Oct 28, 2026 · GitHub Advisory Database

    Fix available

    mediawiki/semantic-media-wiki fixed in 7.2.1

  4. Oct 28, 2026 · GitHub Advisory Database

    Updated

    ### Summary Special:FacetedSearch hidden inputs enable reflected XSS (residual of CVE-2025-10354) ### Details #### Affected versions and vulnerable location - Confirmed present on latest shipped release tag available in the local clone: . - Confirmed present on default branch at HEAD . Vulnerable sink (default-branch representation): - - Builds by concatenating unescaped request-controlled values

Sources

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 29, 2026
  • CVE.orgOct 28, 2026
  • GitHub Advisory DatabaseOct 28, 2026
  • OpenSSF OSV / OSV ScannerOct 28, 2026