CVE-2026-66434

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-07-27. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

Contributor Cross Site Scripting (XSS) in Photonic Gallery & Lightbox for Flickr, SmugMug & Others <= 3.33 versions.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

July 27, 2026

Last Modified

July 27, 2026

References (1)

Vendor Advisories for CVE-2026-66434(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 13× in last 7d / 71× 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. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 23:53 UTCEG score recompute
  3. 2026-08-29 23:53 UTCGHSA enrichment
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-27 12:45 UTCEG score recompute
  6. 2026-08-27 12:45 UTCGHSA enrichment
  7. 2026-08-26 14:47 UTCEPSS rescore
  8. 2026-08-26 10:37 UTCEG score recompute
  9. 2026-08-26 10:37 UTCGHSA enrichment
  10. 2026-08-25 13:49 UTCEPSS rescore
  11. 2026-08-25 07:36 UTCEG score recompute
  12. 2026-08-25 07:36 UTCGHSA enrichment
  13. 2026-08-24 05:29 UTCGHSA enrichment
  14. 2026-08-23 03:21 UTCGHSA enrichment
  15. 2026-08-22 01:13 UTCEG score recompute
  16. 2026-08-22 01:13 UTCGHSA enrichment
  17. 2026-08-21 23:49 UTCEPSS rescore
  18. 2026-08-20 23:06 UTCEG score recompute
  19. 2026-08-20 23:06 UTCGHSA enrichment
  20. 2026-08-20 22:56 UTCEPSS rescore
  21. 2026-08-19 20:58 UTCEG score recompute
  22. 2026-08-19 20:58 UTCGHSA enrichment
  23. 2026-08-19 17:04 UTCEPSS rescore
  24. 2026-08-18 18:46 UTCGHSA enrichment
  25. 2026-08-17 14:07 UTCEG score recompute
Show 63 more
  1. 2026-08-17 14:07 UTCGHSA enrichment
  2. 2026-08-17 13:47 UTCEPSS rescore
  3. 2026-08-16 14:56 UTCEPSS rescore
  4. 2026-08-16 12:00 UTCEG score recompute
  5. 2026-08-16 12:00 UTCGHSA enrichment
  6. 2026-08-15 09:53 UTCEG score recompute
  7. 2026-08-15 09:53 UTCGHSA enrichment
  8. 2026-08-15 01:30 UTCEPSS rescore
  9. 2026-08-14 07:45 UTCEG score recompute
  10. 2026-08-14 07:45 UTCGHSA enrichment
  11. 2026-08-13 22:00 UTCEPSS rescore
  12. 2026-08-13 05:37 UTCEG score recompute
  13. 2026-08-13 05:37 UTCGHSA enrichment
  14. 2026-08-12 13:51 UTCEPSS rescore
  15. 2026-08-12 03:30 UTCEG score recompute
  16. 2026-08-12 03:30 UTCGHSA enrichment
  17. 2026-08-11 01:22 UTCEG score recompute
  18. 2026-08-11 01:22 UTCGHSA enrichment
  19. 2026-08-11 00:00 UTCEPSS rescore
  20. 2026-08-09 23:14 UTCEG score recompute
  21. 2026-08-09 23:14 UTCGHSA enrichment
  22. 2026-08-09 13:47 UTCEPSS rescore
  23. 2026-08-08 21:07 UTCEG score recompute
  24. 2026-08-08 21:07 UTCGHSA enrichment
  25. 2026-08-08 16:37 UTCEPSS rescore
  26. 2026-08-07 18:59 UTCEG score recompute
  27. 2026-08-07 18:59 UTCGHSA enrichment
  28. 2026-08-06 16:52 UTCEG score recompute
  29. 2026-08-06 16:52 UTCGHSA enrichment
  30. 2026-08-06 13:47 UTCEPSS rescore
  31. 2026-08-05 19:17 UTCEPSS rescore
  32. 2026-08-05 19:17 UTCEPSS rescore
  33. 2026-08-05 14:44 UTCEG score recompute
  34. 2026-08-05 14:44 UTCGHSA enrichment
  35. 2026-08-04 15:10 UTCEPSS rescore
  36. 2026-08-04 12:37 UTCEG score recompute
  37. 2026-08-04 12:37 UTCGHSA enrichment
  38. 2026-08-04 10:39 UTCEPSS rescore
  39. 2026-08-03 10:36 UTCEPSS rescore
  40. 2026-08-03 08:51 UTCGHSA enrichment
  41. 2026-08-02 06:44 UTCEG score recompute
  42. 2026-08-02 06:44 UTCGHSA enrichment
  43. 2026-08-02 02:27 UTCEPSS rescore
  44. 2026-08-01 04:37 UTCEG score recompute
  45. 2026-08-01 04:37 UTCGHSA enrichment
  46. 2026-08-01 04:16 UTCEPSS rescore
  47. 2026-07-31 02:27 UTCEG score recompute
  48. 2026-07-31 02:27 UTCGHSA enrichment
  49. 2026-07-30 16:28 UTCEPSS rescore
  50. 2026-07-30 01:30 UTCEPSS rescore
  51. 2026-07-30 00:17 UTCGHSA enrichment
  52. 2026-07-28 22:09 UTCEG score recompute
  53. 2026-07-28 22:09 UTCGHSA enrichment
  54. 2026-07-28 15:37 UTCEPSS rescore
  55. 2026-07-27 19:31 UTCEG score recompute
  56. 2026-07-27 19:30 UTCGHSA enrichment
  57. 2026-07-27 19:06 UTCEG score recompute
  58. 2026-07-27 19:06 UTCGHSA enrichment
  59. 2026-07-27 17:49 UTCEG score recompute
  60. 2026-07-27 17:49 UTCGHSA enrichment
  61. 2026-07-27 15:22 UTCEG score recompute
  62. 2026-07-27 14:26 UTCEG score recompute
  63. 2026-07-27 14:25 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66434?
CVE-2026-66434 is a medium vulnerability published on July 27, 2026. Contributor Cross Site Scripting (XSS) in Photonic Gallery & Lightbox for Flickr, SmugMug & Others <= 3.33 versions.
When was CVE-2026-66434 disclosed?
CVE-2026-66434 was first published in the National Vulnerability Database on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66434 actively exploited?
CVE-2026-66434 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 97.4% of all scored CVEs.
What is the CVSS score of CVE-2026-66434?
CVE-2026-66434 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-66434?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66434, 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

Explore the affected products and dependency analysis for CVE-2026-66434

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