CVE-2026-52854

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 64% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.6Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Maps is a MediaWiki extension that enables visualization of geographic data through dynamic embedded maps. Prior to version 12.1.3, the display_map parser function in the Leaflet service accepts attacker-controlled HTML in the overlays parameter, and resources/leaflet/jquery.leaflet.js uses the overlay name as a Leaflet layer-control label without escaping it. A wiki user with the edit permission can store malicious wikitext that causes script execution when another user previews or views the affected map. The script executes in the viewing user's browser session and can access data or perform actions available to that user. This issue is fixed in version 12.1.3.

CVSS v3
8.6
EG Score
8.6(medium)
EG Risk
70(Attend)
EG Risk 70/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity86% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
49%
KEV
Not listed

Published

July 2, 2026

Last Modified

September 9, 2026

Advisory Details (5)

Auto-updated Aug 18, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github, github_pr.
github_release Patch Available

Maps 12.1.3

Patch available: ProfessionalWiki/Maps 12.1.3

https://github.com/ProfessionalWiki/Maps/releases/tag/12.1.3
generic

Maps/RELEASE-NOTES.md at 12.1.3 · ProfessionalWiki/Maps · GitHub

https://github.com/ProfessionalWiki/Maps/blob/12.1.3/RELEASE-NOTES.md
github_commit Patch Available

commit 737a993fc2f4 (ProfessionalWiki/Maps)

Patch available: ProfessionalWiki/Maps 12.1.3 (contains commit 737a993fc2f4)

https://github.com/ProfessionalWiki/Maps/commit/737a993fc2f40499e9bb22198fd1d56c25613806
github_pr Patch Available

Escape Leaflet layer control labels and enforce the available-layers whitelist

Patch available: ProfessionalWiki/Maps 12.1.3 (PR #899 merged 2026-05-28)

https://github.com/ProfessionalWiki/Maps/pull/899
github Patch Available🟡 PoC Available

Stored XSS through the overlays parameter in the display_map parser function · Advisory · ProfessionalWiki/Maps · GitHub

https://github.com/ProfessionalWiki/Maps/security/advisories/GHSA-4h7g-5542-v3fc

Vendor Advisories for CVE-2026-52854(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
mediawiki/maps10.0.0 ... 9.0.7 (114 versions)12.1.3—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-10 09:35 UTCEPSS rescore
  3. 2026-09-09 22:59 UTCEG score recompute
  4. 2026-09-08 22:01 UTCEPSS rescore
  5. 2026-09-07 16:01 UTCEPSS rescore
  6. 2026-09-06 14:20 UTCEG score recompute
  7. 2026-09-06 13:47 UTCEPSS rescore
  8. 2026-09-05 23:53 UTCEG score recompute
  9. 2026-09-04 05:06 UTCEPSS rescore
  10. 2026-09-02 14:12 UTCEPSS rescore
  11. 2026-09-01 13:54 UTCEPSS rescore
  12. 2026-09-01 04:40 UTCEPSS rescore
  13. 2026-08-30 22:20 UTCEG score recompute
  14. 2026-08-30 19:17 UTCEPSS rescore
  15. 2026-08-30 11:22 UTCEG score recompute
  16. 2026-08-30 01:22 UTCEPSS rescore
  17. 2026-08-28 21:41 UTCEPSS rescore
  18. 2026-08-27 22:15 UTCEG score recompute
  19. 2026-08-27 14:25 UTCEPSS rescore
  20. 2026-08-26 14:46 UTCEPSS rescore
  21. 2026-08-25 13:49 UTCEPSS rescore
  22. 2026-08-24 15:05 UTCEG score recompute
  23. 2026-08-23 06:20 UTCEG score recompute
  24. 2026-08-23 00:19 UTCEPSS rescore
  25. 2026-08-22 06:27 UTCEG score recompute
Show 11 more
  1. 2026-08-21 23:49 UTCEPSS rescore
  2. 2026-08-21 04:27 UTCEG score recompute
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-19 19:21 UTCEG score recompute
  5. 2026-08-19 18:38 UTCEG score recompute
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-18 22:24 UTCEG score recompute
  8. 2026-07-30 22:02 UTCEG score recompute
  9. 2026-07-26 13:04 UTCEG score recompute
  10. 2026-07-23 03:19 UTCEG score recompute
  11. 2026-07-02 18:06 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-52854?
CVE-2026-52854 is a high vulnerability published on July 2, 2026. Maps is a MediaWiki extension that enables visualization of geographic data through dynamic embedded maps. Prior to version 12.1.3, the display_map parser function in the Leaflet service accepts attacker-controlled HTML in the overlays parameter, and resources/leaflet/jquery.leaflet.js uses the…
When was CVE-2026-52854 disclosed?
CVE-2026-52854 was first published in the National Vulnerability Database on July 2, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-52854 actively exploited?
CVE-2026-52854 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.4% of all scored CVEs.
What is the CVSS score of CVE-2026-52854?
CVE-2026-52854 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-52854?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-52854, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-52854

Explore →

Is Your Infrastructure Affected by CVE-2026-52854?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs