CVE-2026-13376

MEDIUMNVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

Score 4.8 from GitHub Security Advisory published 2026-07-03. NVD baseline CVSS 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.8Exploit: None knownExposed: 0

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

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS spamBlocker module allows Stored XSS. This vulnerability is an additional unmitigated attack path for CVE-2025-1071.

This issue affects Fireware OS 12.0 up to and including 12.12, 12.5 up to and including 12.5.18, and 2025.1 up to and including 2026.2.

CVSS v3
4.8
EG Score
4.8(medium)
EG Risk
22(Track)
EG Risk 22/100SSVC: 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
Severity48% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

July 3, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Jul 8, 2026
No patch confirmed yet.
generic

WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in spamBlocker Module | WatchGuard Technologies

https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00018

Vendor Advisories for CVE-2026-13376(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 8× in last 7d / 52× 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.

Showing the most recent 100 of 139 total refreshes for this CVE.

  1. 2026-09-11 14:52 UTCEPSS rescore
  2. 2026-09-11 09:36 UTCEPSS rescore
  3. 2026-09-10 09:34 UTCEPSS rescore
  4. 2026-09-08 22:00 UTCEPSS rescore
  5. 2026-09-07 16:01 UTCEPSS rescore
  6. 2026-09-06 13:47 UTCEPSS rescore
  7. 2026-09-05 23:50 UTCEG score recompute
  8. 2026-09-05 23:50 UTCGHSA enrichment
  9. 2026-09-04 05:06 UTCEPSS rescore
  10. 2026-09-02 14:11 UTCEPSS rescore
  11. 2026-09-01 13:53 UTCEPSS rescore
  12. 2026-09-01 04:39 UTCEPSS rescore
  13. 2026-08-30 19:17 UTCEPSS rescore
  14. 2026-08-30 11:21 UTCEG score recompute
  15. 2026-08-30 11:21 UTCGHSA enrichment
  16. 2026-08-30 01:21 UTCEPSS rescore
  17. 2026-08-28 21:40 UTCEPSS rescore
  18. 2026-08-28 00:39 UTCGHSA enrichment
  19. 2026-08-27 23:29 UTCGHSA enrichment
  20. 2026-08-27 22:13 UTCEG score recompute
  21. 2026-08-27 22:13 UTCGHSA enrichment
  22. 2026-08-27 14:24 UTCEPSS rescore
  23. 2026-08-25 13:48 UTCEPSS rescore
  24. 2026-08-24 23:12 UTCEG score recompute
  25. 2026-08-24 23:12 UTCGHSA enrichment
Show 75 more
  1. 2026-08-23 21:22 UTCGHSA enrichment
  2. 2026-08-22 19:30 UTCEG score recompute
  3. 2026-08-22 19:30 UTCGHSA enrichment
  4. 2026-08-21 23:48 UTCEPSS rescore
  5. 2026-08-21 17:41 UTCEG score recompute
  6. 2026-08-21 17:41 UTCGHSA enrichment
  7. 2026-08-20 22:55 UTCEPSS rescore
  8. 2026-08-20 15:52 UTCEG score recompute
  9. 2026-08-20 15:52 UTCGHSA enrichment
  10. 2026-08-19 17:03 UTCEPSS rescore
  11. 2026-08-19 13:36 UTCGHSA enrichment
  12. 2026-08-18 11:46 UTCEG score recompute
  13. 2026-08-18 11:46 UTCGHSA enrichment
  14. 2026-08-17 06:07 UTCEG score recompute
  15. 2026-08-17 06:06 UTCGHSA enrichment
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 03:30 UTCEG score recompute
  18. 2026-08-16 03:30 UTCGHSA enrichment
  19. 2026-08-16 02:14 UTCEPSS rescore
  20. 2026-08-15 01:41 UTCEG score recompute
  21. 2026-08-15 01:41 UTCGHSA enrichment
  22. 2026-08-15 01:30 UTCEPSS rescore
  23. 2026-08-13 23:53 UTCEG score recompute
  24. 2026-08-13 23:53 UTCGHSA enrichment
  25. 2026-08-13 22:00 UTCEPSS rescore
  26. 2026-08-12 22:04 UTCEG score recompute
  27. 2026-08-12 22:04 UTCGHSA enrichment
  28. 2026-08-12 13:50 UTCEPSS rescore
  29. 2026-08-11 20:15 UTCEG score recompute
  30. 2026-08-11 20:15 UTCGHSA enrichment
  31. 2026-08-11 13:42 UTCEPSS rescore
  32. 2026-08-10 23:59 UTCEPSS rescore
  33. 2026-08-10 18:26 UTCGHSA enrichment
  34. 2026-08-10 17:56 UTCGHSA enrichment
  35. 2026-08-09 18:54 UTCEG score recompute
  36. 2026-08-09 18:54 UTCGHSA enrichment
  37. 2026-08-09 13:46 UTCEPSS rescore
  38. 2026-08-08 17:06 UTCEG score recompute
  39. 2026-08-08 17:06 UTCGHSA enrichment
  40. 2026-08-08 16:37 UTCEPSS rescore
  41. 2026-08-07 15:17 UTCEG score recompute
  42. 2026-08-07 15:17 UTCGHSA enrichment
  43. 2026-08-06 13:46 UTCEPSS rescore
  44. 2026-08-06 13:28 UTCEG score recompute
  45. 2026-08-06 13:28 UTCGHSA enrichment
  46. 2026-08-05 19:17 UTCEPSS rescore
  47. 2026-08-05 11:39 UTCEG score recompute
  48. 2026-08-05 11:38 UTCGHSA enrichment
  49. 2026-08-04 15:09 UTCEPSS rescore
  50. 2026-08-04 10:38 UTCEPSS rescore
  51. 2026-08-04 08:42 UTCEG score recompute
  52. 2026-08-04 08:42 UTCGHSA enrichment
  53. 2026-08-03 10:35 UTCEPSS rescore
  54. 2026-08-03 06:52 UTCGHSA enrichment
  55. 2026-08-02 03:51 UTCEG score recompute
  56. 2026-08-02 03:50 UTCGHSA enrichment
  57. 2026-08-02 02:26 UTCEPSS rescore
  58. 2026-08-01 04:15 UTCEPSS rescore
  59. 2026-08-01 02:02 UTCGHSA enrichment
  60. 2026-07-30 23:29 UTCEG score recompute
  61. 2026-07-30 23:29 UTCGHSA enrichment
  62. 2026-07-30 16:27 UTCEPSS rescore
  63. 2026-07-30 01:30 UTCEPSS rescore
  64. 2026-07-29 21:40 UTCGHSA enrichment
  65. 2026-07-28 17:41 UTCEG score recompute
  66. 2026-07-28 17:41 UTCGHSA enrichment
  67. 2026-07-28 15:36 UTCEPSS rescore
  68. 2026-07-27 15:51 UTCEG score recompute
  69. 2026-07-27 15:51 UTCGHSA enrichment
  70. 2026-07-27 14:13 UTCEPSS rescore
  71. 2026-07-26 14:54 UTCEPSS rescore
  72. 2026-07-26 14:54 UTCEPSS rescore
  73. 2026-07-26 13:00 UTCEG score recompute
  74. 2026-07-26 12:59 UTCGHSA enrichment
  75. 2026-07-25 14:17 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-13376?
CVE-2026-13376 is a medium vulnerability published on July 3, 2026. Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS spamBlocker module allows Stored XSS. This vulnerability is an additional unmitigated attack path for CVE-2025-1071. This issue affects Fireware OS 12.0 up to and…
When was CVE-2026-13376 disclosed?
CVE-2026-13376 was first published in the National Vulnerability Database on July 3, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13376 actively exploited?
CVE-2026-13376 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 80.9% of all scored CVEs.
What is the CVSS score of CVE-2026-13376?
CVE-2026-13376 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-13376?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13376, 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-2026-13376

Explore →

Is Your Infrastructure Affected by CVE-2026-13376?

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

Start Free Scan →Browse All CVEs