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CVE-2026-22256

Salvo cross-site scripting (XSS)

8.8 HIGHPublic exploitEPSS 0.33%
  1. Published8 Jan 2026

Description

Salvo is a Rust web backend framework. Prior to version 0.88.1, the function list_html generate an file view of a folder which include a render of the current path, in which its inserted in the HTML without proper sanitation, this leads to reflected XSS using the fact that request path is decoded and normalized in the matching stage but not is inserted raw in the html view (current.path), the only constraint here is for the root path (eg. /files in the PoC example) to have a sub directory (e.g common ones styles/scripts/etc…) so that the matching return the list HTML page instead of the Not Found page. This issue has been patched in version 0.88.1.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L

Affected products

Salvo< 0.88.1

Remediation

Fixed in
Salvo≥ 0.88.1

References

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Frequently asked

Is CVE-2026-22256 being actively exploited?

CVE-2026-22256 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.33%.

How severe is CVE-2026-22256?

CVE-2026-22256 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.33% probability of exploitation.

Which products are affected by CVE-2026-22256?

Affected products include Salvo.

How do I fix CVE-2026-22256?

Upgrade affected software to a fixed version, for example Salvo 0.88.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-22256 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.