Answer in brief
CVE-2026-13376 records a Medium severity (CVSS 4.8) vulnerability in WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in spamBlocker Module. The current sources do not mark it as known exploited. The current feed maps WatchGuard/Fireware OS (generic), WatchGuard/Fireware OS (generic), WatchGuard/Fireware OS (generic), WatchGuard/Fireware OS (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps WatchGuard/Fireware OS (generic), WatchGuard/Fireware OS (generic), WatchGuard/Fireware OS (generic), WatchGuard/Fireware OS (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:h:watchguard:fireboxcloud:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m270:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m290:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m295:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m370:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m390:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m395:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m440:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m4600:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m470:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m4800:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m495:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m5600:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m570:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m5800:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m590:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m595:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m670:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m690:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_m695:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_nv5:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t115-w:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t125:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t125-w:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t145:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t145-w:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t15:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t185:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t20:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t25:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t35:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t40:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t45:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t55:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t70:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t80:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:firebox_t85:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:h:watchguard:fireboxv:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| WatchGuard/Fireware OSgeneric | >=2025.1 <2026.2.1 || >=12.0 <12.12.1 | 2026.2.1, 12.12.1 |
| WatchGuard/Fireware OSgeneric | >=12.0 <12.5.19 | 12.5.19 |
| WatchGuard/Fireware OSgeneric | 12.0 || 12.5 || 2025.1 | Not reported |
| WatchGuard/Fireware OSgeneric | >=12.0 <12.11.9 | 12.11.9 |
Published upstream
Jul 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 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 including 12.12, 12.5 up to and including 12.5.18, and 2025.1 up to and including 2026.2.
Quoted source text, attributed separately from HOL analysis.