CVE-2026-6566

MEDIUMNVD 4.34.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 4.3 from GitHub Security Advisory published 2026-05-20. NVD baseline CVSS 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
4.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 4.3Exploit: None knownExposed services: Not assessed

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

The CVE record's CNA (Wordfence) lists smub Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery versions up to and including 4.2.0 as affected. No release containing a fix is confirmed on record.

The Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to and including 4.2.0. This is due to insufficient object-level authorization in the image deletion REST flow where the permission callback for DELETE /imagely/v1/images/{id} only checks 'NextGEN Manage gallery' permissions and does not enforce gallery ownership or 'NextGEN Manage others gallery' permissions. This makes it possible for authenticated attackers, with Subscriber-level privileges and 'NextGEN Manage gallery' capability, to delete gallery images belonging to other users as well as their associated image files from disk when deleteImg is enabled (default).

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
19
EG Risk 19/100

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 (value × EchelonGraph’s weight)
Severity43% × 45%
The EG Score, 4.3 of 10.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
16th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 20, 2026

Last Modified

July 24, 2026

References (2)

Vendor Advisories for CVE-2026-6566(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 10× in last 7d / 25× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 217 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 120 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 19:31 UTCEG score recompute
  2. 2026-10-11 16:47 UTCEG score recompute
  3. 2026-10-11 14:08 UTCEG score recompute
  4. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  6. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  7. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  8. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  9. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  10. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  11. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  12. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  13. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  14. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  15. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  16. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  17. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  18. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  19. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  20. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  21. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  22. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  23. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  24. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  25. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.3% · 18th percentile
Show 72 more
  1. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  2. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  3. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  4. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  5. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  6. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  7. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  8. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  9. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  10. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  11. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  12. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  13. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  14. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  15. 2026-08-23 16:57 UTCEG score recompute
  16. 2026-08-23 16:57 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  17. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  18. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  19. 2026-08-21 22:56 UTCEG score recompute
  20. 2026-08-21 22:56 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  21. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  22. 2026-08-20 18:56 UTCEG score recompute
  23. 2026-08-20 18:56 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  24. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  25. 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  26. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  27. 2026-08-17 09:54 UTCEG score recompute
  28. 2026-08-17 09:54 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  29. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  30. 2026-08-16 03:30 UTCEG score recompute
  31. 2026-08-16 03:30 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  32. 2026-08-16 02:15 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  33. 2026-08-15 01:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  34. 2026-08-15 01:07 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  35. 2026-08-14 02:03 UTCEG score recompute
  36. 2026-08-14 02:03 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  37. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  38. 2026-08-12 22:49 UTCEG score recompute
  39. 2026-08-12 22:49 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  40. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  41. 2026-08-11 23:44 UTCEG score recompute
  42. 2026-08-11 23:44 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  43. 2026-08-11 00:36 UTCEG score recompute
  44. 2026-08-11 00:36 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  45. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  46. 2026-08-10 00:37 UTCEG score recompute
  47. 2026-08-10 00:37 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  48. 2026-08-09 13:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  49. 2026-08-09 01:33 UTCEG score recompute
  50. 2026-08-09 01:33 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  51. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  52. 2026-08-07 19:30 UTCEG score recompute
  53. 2026-08-07 19:30 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  54. 2026-08-06 20:24 UTCEG score recompute
  55. 2026-08-06 20:24 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  56. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  57. 2026-08-05 21:19 UTCEG score recompute
  58. 2026-08-05 21:19 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  59. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  60. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  61. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  62. 2026-08-03 16:54 UTCEG score recompute
  63. 2026-08-03 16:54 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  64. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  65. 2026-08-02 16:52 UTCEG score recompute
  66. 2026-08-02 16:52 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  67. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  68. 2026-08-01 17:47 UTCEG score recompute
  69. 2026-08-01 17:47 UTCGHSA enrichmentGHSA-4hjj-956w-4cwm · GitHub CVSS 4.3
  70. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  71. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  72. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.3% · 18th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-6566?
CVE-2026-6566 is a medium-severity vulnerability; its CVE record was published on May 20, 2026. The Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to and including 4.2.0. This is due to insufficient object-level authorization in the image deletion REST flow where the permission callback for…
When was the CVE record for CVE-2026-6566 published?
The CVE record for CVE-2026-6566 was published on May 20, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 24, 2026; the record at its source may have been updated since.
Is CVE-2026-6566 actively exploited?
CVE-2026-6566 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (16th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-6566?
CVE-2026-6566 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-6566?
No fix for CVE-2026-6566 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (Wordfence) lists smub Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery versions up to and including 4.2.0 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-6566 are linked in the Vendor Advisories panel on this page.

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