CVE-2026-8874: Version 3.0.7 of the Securly Chrome Extension downloads JSON files containing crisis alert keywords and filter

Routine

HIGH 7.1DOWNGRADE

CVE-2026-8874 is a high-severity flaw (CVSS 7.1) affecting securly. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.1 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-319
Published	2026-06-03
Last modified	2026-07-22

Publisher (CNA): CERT/CC · Vendor: securly

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-03 19:16 UTCPublished CVE record published
2026-07-22 20:10 UTCUpdated Record last modified

securly securly DOWNGRADE

Affected: 3.0.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.7

1. Check installed version

apt-cache policy securly || rpm -q securly || securly --version

2. No fixed release: DOWNGRADE to a release before 3.0.7 (Debian / Ubuntu)

apt-cache madison securly sudo apt install securly=<VERSION_BEFORE_3.0.7> sudo apt-mark hold securly

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list securly sudo dnf downgrade securly-<VERSION_BEFORE_3.0.7> sudo dnf versionlock add securly

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-8874?

securly: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-8874 being exploited?

CVE-2026-8874 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-8874 affect?

CVE-2026-8874 affects securly. Severity is high (CVSS 7.1). 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 HT

How urgent is CVE-2026-8874?

Priority 26/100. High severity

Software pages

Google Chrome vulnerabilities

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References

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