[NEW] [medium] OPNsense: Multiple vulnerabilities enable cross-site scripting

mediumCVE-2026-49131 CVE-2026-49132

A remote authenticated attacker can exploit multiple vulnerabilities in OPNsense to conduct a cross-site scripting attack.

CSIRTS triage

vendor: OPNsense product: OPNsense Cross-site scripting

What: Multiple vulnerabilities allow remote authenticated attackers to conduct cross-site scripting attacks.
Who is affected: OPNsense deployments accessible to authenticated users.
Urgency: Medium severity XSS requiring authentication; not currently exploited.
Action: Update OPNsense to the latest patched version.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-08-04
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2635

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-491310.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-491320.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-49131	coverage & exploitation status	NVD · CVE.org
CVE-2026-49132	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for OPNsense

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[NEU] [hoch] OPNsense: Schwachstelle ermöglicht Privilegieneskalationcert-bund · 2026-09-09
criticalCVE-2026-53581: OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.9 of opnsense…nvd · 2026-09-08
medium[NEW] [medium] OPNsense: Vulnerability allows bypass of security measurescert-bund · 2026-08-26
medium[NEW] [medium] OPNsense: Multiple Vulnerabilitiescert-bund · 2026-08-12
mediumCVE-2026-49132: OPNsense before 26.1.9 contains a stored cross-site scripting vulnerability that allows authen…nvd · 2026-08-03
mediumCVE-2026-49131: OPNsense before 26.1.9 contains a stored cross-site scripting vulnerability that allows authen…nvd · 2026-08-03