CVE-2018-6824: Cozy version 2 has XSS allowing remote attackers to obtain administrative access via JavaScript code in the ur

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MEDIUM 6.1DOWNGRADE

CVE-2018-6824 is a medium-severity flaw (CVSS 6.1) affecting cozy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cozy version 2 has XSS allowing remote attackers to obtain administrative access via JavaScript code in the url parameter to the /api/proxy URI, as demonstrated by an XMLHttpRequest call with an 'email:"attacker@example.com"' request, which can be followed by a password reset.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-02-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cozy

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-02-07 17:29 UTCPublished CVE record published
2026-06-17 02:02 UTCUpdated Record last modified

cozy cozy DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison cozy sudo apt install cozy=<VERSION_BEFORE_2.0> sudo apt-mark hold cozy

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

dnf --showduplicates list cozy sudo dnf downgrade cozy-<VERSION_BEFORE_2.0> sudo dnf versionlock add cozy

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-2018-6824?

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

Is CVE-2018-6824 being exploited?

CVE-2018-6824 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-2018-6824 affect?

CVE-2018-6824 affects cozy. Severity is medium (CVSS 6.1). Cozy version 2 has XSS allowing remote attackers to obtain administrative access via JavaScript code in the url parameter to the /api/proxy URI, as demonstrated by an XMLHttpRequest call with an 'email:"attacker@example.com"' request, which

How urgent is CVE-2018-6824?

Priority 40/100. Public exploit reference

References

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