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CVE-2026-32308

Hackerbay Oneuptime cross-site scripting (XSS)

7.6 HIGHPublic exploitEPSS 0.31%
  1. Published13 Mar 2026

Description

OneUptime is a solution for monitoring and managing online services. Prior to 10.0.23, the Markdown viewer component renders Mermaid diagrams with securityLevel: "loose" and injects the SVG output via innerHTML. This configuration explicitly allows interactive event bindings in Mermaid diagrams, enabling XSS through Mermaid's click directive which can execute arbitrary JavaScript. Any field that renders markdown (incident descriptions, status page announcements, monitor notes) is vulnerable. This vulnerability is fixed in 10.0.23.

CVSS 3.1 breakdown

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

Affected products

Hackerbay Oneuptime< 10.0.23

Remediation

Fixed in
Hackerbay Oneuptime≥ 10.0.23

References

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Frequently asked

Is CVE-2026-32308 being actively exploited?

CVE-2026-32308 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.31%.

How severe is CVE-2026-32308?

CVE-2026-32308 has a CVSS 3.1 base score of 7.6, rated high. EPSS estimates a 0.31% probability of exploitation.

Which products are affected by CVE-2026-32308?

Affected products include Hackerbay Oneuptime.

How do I fix CVE-2026-32308?

Upgrade affected software to a fixed version, for example Hackerbay Oneuptime 10.0.23 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-32308 against the real software inventory on every managed device, as each hourly inventory arrives. 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.