CVE-2026-18316

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-16. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

The Solace Extra plugin for WordPress is vulnerable to unauthorized modification and loss of data due to a missing capability check on the import_zip() function in versions up to, and including, 1.6.0. The handler is registered on both wp_ajax_action-import-zip and wp_ajax_nopriv_action-import-zip and only verifies the 'ajax-nonce' nonce, which is emitted on every admin page via wp_localize_script (unrestricted admin_enqueue_scripts hook) and is therefore accessible to any authenticated user including Subscribers. This makes it possible for authenticated attackers, with Subscriber-level access and above, to wipe navigation menus, sidebar widgets (via update_option('sidebars_widgets', array())), all theme mods (via remove_theme_mods()), and Elementor templates, as well as trigger arbitrary demo-content imports.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
56(Track)
EG Risk 56/100SSVC: Track

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
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

August 16, 2026

Last Modified

August 20, 2026

References (5)

Vendor Advisories for CVE-2026-18316(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 50× in last 7d / 50× 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. 2026-08-21 07:23 UTCGHSA enrichment
  2. 2026-08-21 03:44 UTCGHSA enrichment
  3. 2026-08-21 00:06 UTCEG score recompute
  4. 2026-08-21 00:06 UTCGHSA enrichment
  5. 2026-08-20 22:55 UTCEPSS rescore
  6. 2026-08-20 20:26 UTCGHSA enrichment
  7. 2026-08-20 16:47 UTCGHSA enrichment
  8. 2026-08-20 13:00 UTCGHSA enrichment
  9. 2026-08-20 10:44 UTCGHSA enrichment
  10. 2026-08-20 07:05 UTCGHSA enrichment
  11. 2026-08-20 03:26 UTCGHSA enrichment
  12. 2026-08-19 23:47 UTCGHSA enrichment
  13. 2026-08-19 20:08 UTCEG score recompute
  14. 2026-08-19 20:08 UTCGHSA enrichment
  15. 2026-08-19 17:03 UTCEPSS rescore
  16. 2026-08-19 16:28 UTCGHSA enrichment
  17. 2026-08-19 12:49 UTCGHSA enrichment
  18. 2026-08-19 09:10 UTCGHSA enrichment
  19. 2026-08-19 05:32 UTCGHSA enrichment
  20. 2026-08-19 01:53 UTCGHSA enrichment
  21. 2026-08-18 22:14 UTCGHSA enrichment
  22. 2026-08-18 18:35 UTCGHSA enrichment
  23. 2026-08-18 14:57 UTCEG score recompute
  24. 2026-08-18 14:57 UTCGHSA enrichment
  25. 2026-08-18 13:48 UTCEPSS rescore
Show 25 more
  1. 2026-08-18 10:37 UTCGHSA enrichment
  2. 2026-08-18 06:58 UTCGHSA enrichment
  3. 2026-08-18 03:19 UTCGHSA enrichment
  4. 2026-08-17 23:39 UTCGHSA enrichment
  5. 2026-08-17 20:00 UTCEG score recompute
  6. 2026-08-17 19:59 UTCGHSA enrichment
  7. 2026-08-17 16:20 UTCEG score recompute
  8. 2026-08-17 16:20 UTCGHSA enrichment
  9. 2026-08-17 15:30 UTCEG score recompute
  10. 2026-08-17 15:30 UTCGHSA enrichment
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-17 11:51 UTCGHSA enrichment
  13. 2026-08-17 08:12 UTCGHSA enrichment
  14. 2026-08-17 04:34 UTCGHSA enrichment
  15. 2026-08-17 00:55 UTCGHSA enrichment
  16. 2026-08-16 21:16 UTCGHSA enrichment
  17. 2026-08-16 17:37 UTCEG score recompute
  18. 2026-08-16 17:37 UTCGHSA enrichment
  19. 2026-08-16 14:56 UTCEPSS rescore
  20. 2026-08-16 13:48 UTCGHSA enrichment
  21. 2026-08-16 10:09 UTCGHSA enrichment
  22. 2026-08-16 06:30 UTCEG score recompute
  23. 2026-08-16 06:30 UTCGHSA enrichment
  24. 2026-08-16 05:34 UTCEG score recompute
  25. 2026-08-16 05:34 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-18316?
CVE-2026-18316 is a critical vulnerability published on August 16, 2026. The Solace Extra plugin for WordPress is vulnerable to unauthorized modification and loss of data due to a missing capability check on the importzip() function in versions up to, and including, 1.6.0. The handler is registered on both wpajaxaction-import-zip and wpajaxnoprivaction-import-zip and…
When was CVE-2026-18316 disclosed?
CVE-2026-18316 was first published in the National Vulnerability Database on August 16, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18316 actively exploited?
CVE-2026-18316 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 74.6% of all scored CVEs.
What is the CVSS score of CVE-2026-18316?
CVE-2026-18316 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-18316?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18316, 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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