How severe is CVE-2026-58525?

CVE-2026-58525 has a CVSS score of 8.2/10, rated HIGH. Immediate patching is strongly recommended.

Which products are affected by CVE-2026-58525?

CVE-2026-58525 affects the following products: microsoft edge chromium.

How do I patch CVE-2026-58525?

Apply the microsoft edge chromium security patch or hotfix for CVE-2026-58525 on the affected version, following the vendor advisory for your exact build.

How do I detect CVE-2026-58525 across my infrastructure?

Inventory every microsoft edge chromium deployment and check each version against the affected-products list above.

How do I mitigate CVE-2026-58525 if there is no patch (or I can't update yet)?

Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Is CVE-2026-58525 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-58525 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-58525?

CVE-2026-58525 has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 41th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-58525?

CVE-2026-58525 is classified as CWE-284 (CWE-284). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2026-58525?

CVE-2026-58525 affects microsoft edge chromium. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2026-58525 published, and has it been updated?

CVE-2026-58525 was published on July 8, 2026 and was last updated on July 9, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🛡️

Not in CISA KEV

HIGH severity

CVE-2026-58525 — Edge Chromium

HIGH

CVE-2026-58525 is a high-severity (CVSS 8.2) CWE-284 vulnerability in microsoft edge chromium. A fix is available — see the affected versions and patch details below.

Improper access control in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.

Published

Jul 8, 2026

Updated

Jul 9, 2026

Affected

1 product

Patched

See advisory

Exploits

None indexed

Exploitation data as of Sep 30, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-58525.

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs41th percentile — riskier than 41% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-58525 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 380,526 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Description

Improper access control in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.

Affected Products

1 product · 1 configurations

Application

edge chromiummicrosoft

< 150.0.4078.50

range

Detection & mitigation playbook

Vendor / appliance

Detect
Inventory every microsoft edge chromium deployment and check each version against the affected-products list above.
Fix
Apply the microsoft edge chromium security patch or hotfix for CVE-2026-58525 on the affected version, following the vendor advisory for your exact build.
Workarounds
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

Improper access control in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.

O3 Security · Runtime Protection

Is CVE-2026-58525 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

Protect my workloads How runtime protection works

CVE-2026-58525 — Edge Chromium

Exploitation Status

No confirmed exploitation observed yet

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Description

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is CVE-2026-58525 being exploited in your environment?