CVE-2026-8839

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-06-06. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.3Exploit: NoneExposed: 0

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

The MapPress Maps for WordPress plugin for WordPress is vulnerable to Authorization Bypass Through User-Controlled Key in all versions up to, and including, 2.96.6. This is due to missing ownership verification in the REST API routes registered via Mappress_Api::rest_api_init(), where the GET /wp-json/mapp/v1/maps/{mapid} endpoint uses 'permission_callback' => '__return_true' and the write endpoints (POST update, DELETE, PATCH mutate, POST clone, POST empty_trash) only check the generic edit_posts capability without confirming that the requester owns the targeted map — a gap that is not compensated at the model layer, as Mappress_Map::get(), save(), delete(), mutate(), and empty_trash() all operate on any caller-supplied map ID without an ownership check. This makes it possible for unauthenticated attackers to read sensitive map data — including POI titles, addresses, coordinates, and body content — for any map on the site by enumerating map IDs, and for authenticated attackers with Contributor-level access and above to modify, delete, trash/restore, or clone any map regardless of its author.

CVSS v3
5.3
EG Score
5.3(high)
EPSS
52.6%
KEV
Not listed

Published

June 6, 2026

Last Modified

June 8, 2026

References (24)

Vendor Advisories for CVE-2026-8839(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 93× 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. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 02:23 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 19:13 UTCEG score recompute
  6. 2026-07-05 19:13 UTCGHSA enrichment
  7. 2026-07-05 02:31 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 20:21 UTCEG score recompute
  10. 2026-07-04 20:21 UTCGHSA enrichment
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-03 16:34 UTCEG score recompute
  14. 2026-07-03 16:34 UTCGHSA enrichment
  15. 2026-07-02 14:38 UTCEG score recompute
  16. 2026-07-02 14:38 UTCGHSA enrichment
  17. 2026-07-01 15:46 UTCEG score recompute
  18. 2026-07-01 15:46 UTCGHSA enrichment
  19. 2026-07-01 15:07 UTCEPSS rescore
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 16:51 UTCEG score recompute
  22. 2026-06-30 16:51 UTCGHSA enrichment
  23. 2026-06-29 16:18 UTCEG score recompute
  24. 2026-06-29 16:17 UTCGHSA enrichment
  25. 2026-06-29 14:06 UTCEPSS rescore
Show 72 more
  1. 2026-06-28 17:21 UTCEG score recompute
  2. 2026-06-28 17:21 UTCGHSA enrichment
  3. 2026-06-28 14:07 UTCEPSS rescore
  4. 2026-06-28 04:56 UTCEPSS rescore
  5. 2026-06-27 18:29 UTCEG score recompute
  6. 2026-06-27 18:29 UTCGHSA enrichment
  7. 2026-06-27 03:08 UTCEPSS rescore
  8. 2026-06-26 19:37 UTCEG score recompute
  9. 2026-06-26 19:37 UTCGHSA enrichment
  10. 2026-06-25 20:45 UTCEG score recompute
  11. 2026-06-25 20:45 UTCGHSA enrichment
  12. 2026-06-25 13:50 UTCEPSS rescore
  13. 2026-06-24 21:52 UTCEG score recompute
  14. 2026-06-24 21:52 UTCGHSA enrichment
  15. 2026-06-24 14:05 UTCEPSS rescore
  16. 2026-06-23 23:00 UTCEG score recompute
  17. 2026-06-23 23:00 UTCGHSA enrichment
  18. 2026-06-23 21:33 UTCEPSS rescore
  19. 2026-06-22 22:56 UTCEG score recompute
  20. 2026-06-22 22:55 UTCGHSA enrichment
  21. 2026-06-22 14:25 UTCEPSS rescore
  22. 2026-06-21 20:33 UTCEG score recompute
  23. 2026-06-21 20:33 UTCGHSA enrichment
  24. 2026-06-21 14:56 UTCEPSS rescore
  25. 2026-06-21 01:59 UTCEPSS rescore
  26. 2026-06-20 13:59 UTCEG score recompute
  27. 2026-06-20 13:59 UTCGHSA enrichment
  28. 2026-06-19 19:26 UTCEPSS rescore
  29. 2026-06-19 15:07 UTCEG score recompute
  30. 2026-06-19 15:07 UTCGHSA enrichment
  31. 2026-06-18 17:52 UTCEPSS rescore
  32. 2026-06-18 16:07 UTCEG score recompute
  33. 2026-06-18 16:07 UTCGHSA enrichment
  34. 2026-06-17 17:53 UTCEPSS rescore
  35. 2026-06-17 17:14 UTCEG score recompute
  36. 2026-06-17 17:14 UTCGHSA enrichment
  37. 2026-06-16 17:53 UTCEPSS rescore
  38. 2026-06-16 17:28 UTCEG score recompute
  39. 2026-06-16 17:28 UTCGHSA enrichment
  40. 2026-06-15 18:35 UTCEG score recompute
  41. 2026-06-15 18:35 UTCGHSA enrichment
  42. 2026-06-15 17:49 UTCEPSS rescore
  43. 2026-06-15 17:49 UTCEPSS rescore
  44. 2026-06-14 23:18 UTCEPSS rescore
  45. 2026-06-14 18:40 UTCEG score recompute
  46. 2026-06-14 18:40 UTCGHSA enrichment
  47. 2026-06-13 23:00 UTCEPSS rescore
  48. 2026-06-13 19:48 UTCEG score recompute
  49. 2026-06-13 19:48 UTCGHSA enrichment
  50. 2026-06-12 23:12 UTCEPSS rescore
  51. 2026-06-12 23:12 UTCEPSS rescore
  52. 2026-06-12 20:52 UTCEG score recompute
  53. 2026-06-12 20:52 UTCGHSA enrichment
  54. 2026-06-11 22:01 UTCEG score recompute
  55. 2026-06-11 22:01 UTCGHSA enrichment
  56. 2026-06-11 14:00 UTCEPSS rescore
  57. 2026-06-10 23:08 UTCEG score recompute
  58. 2026-06-10 23:08 UTCGHSA enrichment
  59. 2026-06-10 22:19 UTCEPSS rescore
  60. 2026-06-10 13:22 UTCEPSS rescore
  61. 2026-06-10 00:16 UTCEG score recompute
  62. 2026-06-10 00:16 UTCGHSA enrichment
  63. 2026-06-09 01:24 UTCEG score recompute
  64. 2026-06-09 01:24 UTCGHSA enrichment
  65. 2026-06-08 14:17 UTCEPSS rescore
  66. 2026-06-08 02:32 UTCEG score recompute
  67. 2026-06-08 02:32 UTCGHSA enrichment
  68. 2026-06-07 15:25 UTCEPSS rescore
  69. 2026-06-07 03:40 UTCEG score recompute
  70. 2026-06-07 03:40 UTCGHSA enrichment
  71. 2026-06-06 13:47 UTCEPSS rescore
  72. 2026-06-06 04:48 UTCEG score recompute

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-8839.yaml
    First seen Jan 1, 2026

    WordPress MapPress Maps <= 2.96.6 - Unauthenticated IDOR

    Open source ↗

Frequently asked(5)

What is CVE-2026-8839?
CVE-2026-8839 is a medium vulnerability published on June 6, 2026. The MapPress Maps for WordPress plugin for WordPress is vulnerable to Authorization Bypass Through User-Controlled Key in all versions up to, and including, 2.96.6. This is due to missing ownership verification in the REST API routes registered via MappressApi::restapiinit(), where the GET…
When was CVE-2026-8839 disclosed?
CVE-2026-8839 was first published in the National Vulnerability Database on June 6, 2026, with the most recent update on June 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8839 actively exploited?
CVE-2026-8839 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 52.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8839?
CVE-2026-8839 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-8839?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8839, 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

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