How severe is CVE-2026-8874?

CVE-2026-8874 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.

Is CVE-2026-8874 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.

What products are affected by CVE-2026-8874?

CVE-2026-8874 affects Securly. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-8874?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-8874 have an EU (EUVD) identifier?

Yes. CVE-2026-8874 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34161.

When was CVE-2026-8874 published?

CVE-2026-8874 was published on 2026-06-03 and last updated on 2026-06-17.

CVE-2026-8874

CVE-2026-8874 is a high-severity vulnerability in Securly with a CVSS 3.x base score of 7.1. 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-319.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34161
Weakness: CWE-319
Affected product: Securly
Published: 2026-06-03
Last modified: 2026-06-17

Description

Version 3.0.7 of the Securly Chrome Extension downloads JSON files containing crisis alert keywords and filtering rules over unencrypted HTTP via the Fetch API. Other endpoints in the same extension correctly fetch IWF and CIPA data over HTTPS, demonstrating an inconsistent implementation of TLS.

Frequently asked questions

What is CVE-2026-8874?: Version 3.0.7 of the Securly Chrome Extension downloads JSON files containing crisis alert keywords and filtering rules over unencrypted HTTP via the Fetch API. Other endpoints in the same extension correctly fetch IWF and CIPA data over HTTPS, demonstrating an inconsistent implementation of TLS.
How severe is CVE-2026-8874?: CVE-2026-8874 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.
Is CVE-2026-8874 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.
What products are affected by CVE-2026-8874?: CVE-2026-8874 affects Securly. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-8874?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-8874 have an EU (EUVD) identifier?: Yes. CVE-2026-8874 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34161.
When was CVE-2026-8874 published?: CVE-2026-8874 was published on 2026-06-03 and last updated on 2026-06-17.

References

https://kb.cert.org/vuls/id/595768

Affected products (1)

cpe:2.3:a:securly:securly:3.0.7:*:*:*:*:chrome:*:*

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CVE-2026-8889 — High (CVSS 7.5): Version 3.0.7 of the Securly Chrome Extension uses deprecated SHA-1 hashing for IWF CSAM URL matching (25,020 hashes)…
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CVE-2026-8881 — High (CVSS 7.5): Version 3.0.7 of the Securly Chrome Extension uses EVP_BytesToKey key derivation with MD5 and a single iteration for…
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