How severe is CVE-2026-25740?

CVE-2026-25740 has a CVSS 4.0 base score of 5.8, rated medium severity.

Is CVE-2026-25740 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-25740?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-25740 have an EU (EUVD) identifier?

Yes. CVE-2026-25740 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6848.

When was CVE-2026-25740 published?

CVE-2026-25740 was published on 2026-02-09 and last updated on 2026-06-17.

CVE-2026-25740

CVE-2026-25740 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-250.

Key facts

Severity: Medium (CVSS 4.0 base score 5.8)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-6848
Weakness: CWE-250
Published: 2026-02-09
Last modified: 2026-06-17

Description

captive browser, a dedicated Chrome instance to log into captive portals without messing with DNS settings. In 25.05 and earlier, when programs.captive-browser is enabled, any user of the system can run arbitrary commands with the CAP_NET_RAW capability (binding to privileged ports, spoofing localhost traffic from privileged services...). This vulnerability is fixed in 25.11 and 26.05.

Frequently asked questions

What is CVE-2026-25740?: captive browser, a dedicated Chrome instance to log into captive portals without messing with DNS settings. In 25.05 and earlier, when programs.captive-browser is enabled, any user of the system can run arbitrary commands with the CAP_NET_RAW capability (binding to privileged ports, spoofing localhost traffic from privileged services...). This vulnerability is fixed in 25.11 and 26.05.
How severe is CVE-2026-25740?: CVE-2026-25740 has a CVSS 4.0 base score of 5.8, rated medium severity.
Is CVE-2026-25740 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-25740?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-25740 have an EU (EUVD) identifier?: Yes. CVE-2026-25740 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6848.
When was CVE-2026-25740 published?: CVE-2026-25740 was published on 2026-02-09 and last updated on 2026-06-17.

References

Other CWE-250 vulnerabilities

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