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Vulnerability record · CVE-2026-8874 · published 3 June 2026

CVE-2026-8874: Securly cleartext transmission vulnerability

Securly · Securly

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.

7.1 CVSS 3.1 High EPSS 0.17% · top 94.5% CWE-319 · Cleartext transmission
7.1CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
22 Jul 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://kb.cert.org/vuls/id/595768 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2026-8878Securly inadequate encryption strength vulnerabilityVersion 3.0.7 of the Securly Chrome Extension exposes multiple publicly accessible endpoints that allow unauthenticated access to sensitive data. The…EPSS 0.26%7.5CVE-2026-8879Securly inclusion from untrusted sphere vulnerabilityVersion 3.0.7 of the Securly Chrome Extension dynamically registers content13.min.js as a content script via chrome.scripting.registerContentScripts(…EPSS 0.51%7.5CVE-2026-8881Securly vulnerabilityVersion 3.0.7 of the Securly Chrome Extension uses EVP_BytesToKey key derivation with MD5 and a single iteration for AES encryption. MD5 has been bro…EPSS 0.20%7.5CVE-2026-8888Securly expression language injection vulnerabilityVersion 3.0.7 of the Securly Chrome Extension downloads config.json over HTTP and compiles server-provided patterns as JavaScript regular expressions…EPSS 0.60%7.5CVE-2026-8889Securly vulnerabilityVersion 3.0.7 of the Securly Chrome Extension uses deprecated SHA-1 hashing for IWF CSAM URL matching (25,020 hashes) and CIPA blocklist matching (12…EPSS 0.32%7.3CVE-2026-8876Securly hard-coded credentials vulnerabilityVersion 3.0.7 of the Securly Chrome Extension contains hardcoded, plaintext AES passphrases in securly.min.js. These keys decrypt crisis alert keywor…EPSS 0.30%

Source: NIST National Vulnerability Database (record CVE-2026-8874), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.