CVE-2026-49131
mediumpriority · track · 0EPSS 0.003 · 21 %ileDEEUEPSS · scored 2026-10-27
OPNsense before 26.1.9 contains a stored cross-site scripting vulnerability that allows authenticated attackers with firewall rule management privileges to inject arbitrary HTML or JavaScript by embedding payloads in the firewall rule description field via the filter API endpoint. The unsanitized description value is persisted and later rendered through the default cell formatter in opnsense_bootgrid.js, which assigns raw cell content to innerHTML, causing injected scripts to execute in the browser of any authenticated user who views the Firewall Rules page, enabling session hijacking or credential theft.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.2–5.4
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (3)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-2635OPNsense: Mehrere Schwachstellen ermöglichen Cross-Site ScriptingDeutsch2026-08-03csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in OPNsense ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (9)
External citations — patches, advisories, analysis.
- https://docs.opnsense.org/releases/CE_26.1.html#june-02-2026cnnvd
- https://github.com/opnsense/core/commit/b11d6b340716e240868ab19a369e058a46f0876fcnnvd
- https://www.vulncheck.com/advisories/opnsense-stored-xss-via-firewall-rule-description-fieldcnnvd
- https://docs.opnsense.org/releases/CE_26.1.html#june-02-2026enisa_euvd
- https://github.com/opnsense/core/commit/b11d6b340716e240868ab19a369e058a46f0876fenisa_euvd
- https://www.vulncheck.com/advisories/opnsense-stored-xss-via-firewall-rule-description-fieldenisa_euvd
- https://docs.opnsense.org/releases/CE_26.1.html#june-02-2026nvd
- https://github.com/opnsense/core/commit/b11d6b340716e240868ab19a369e058a46f0876fnvd
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