CVE-2004-0870: KDE Konqueror does not prevent cookies that are sent over an insecure channel (HTTP) from also being sent over

Routine

MEDIUM 5.0DOWNGRADE

CVE-2004-0870 is a medium-severity flaw (CVSS 5.0) affecting konqueror. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

KDE Konqueror does not prevent cookies that are sent over an insecure channel (HTTP) from also being sent over a secure channel (HTTPS/SSL) in the same domain, which could allow remote attackers to steal cookies and conduct unauthorized activities, aka "Cross Security Boundary Cookie Injection."

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Published	2004-09-16
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: kde

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2004-09-16 04:00 UTCPublished CVE record published
2026-06-16 22:06 UTCUpdated Record last modified

kde konqueror DOWNGRADE

Affected: 2.1.1 · 2.1.2 · 2.2.1 · 2.2.2 · 3.0 · 3.0.1 · 3.0.2 · 3.0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.1.1 (Debian / Ubuntu)

apt-cache madison konqueror sudo apt install konqueror=<VERSION_BEFORE_2.1.1> sudo apt-mark hold konqueror

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

dnf --showduplicates list konqueror sudo dnf downgrade konqueror-<VERSION_BEFORE_2.1.1> sudo dnf versionlock add konqueror

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-2004-0870?

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

Is CVE-2004-0870 being exploited?

CVE-2004-0870 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-2004-0870 affect?

CVE-2004-0870 affects konqueror. Severity is medium (CVSS 5.0). KDE Konqueror does not prevent cookies that are sent over an insecure channel (HTTP) from also being sent over a secure channel (HTTPS/SSL) in the same domain, which could allow remote attackers to steal cookies and conduct unauthorized act

How urgent is CVE-2004-0870?

Priority 36/100. No elevated risk signals yet.

Related CVEs

CVE-2009-2537 MEDIUM 4.3 MITIGATE KDE Konqueror allows remote attackers to cause a denial of service (memory consumption) via a large integer va
CVE-2008-5712 MEDIUM 5.0 DOWNGRADE The HTML parser in KDE Konqueror 3.5.9 allows remote attackers to cause a denial of service (application crash
CVE-2008-5698 MEDIUM 4.3 MITIGATE HTMLTokenizer::scriptHandler in Konqueror in KDE 3.5.9 and 3.5.10 allows remote attackers to cause a denial of
CVE-2008-4514 MEDIUM 5.0 DOWNGRADE The HTML parser in KDE Konqueror 3.5.9 allows remote attackers to cause a denial of service (application crash
CVE-2008-4382 MEDIUM 5.0 DOWNGRADE Konqueror in KDE 3.5.9 allows remote attackers to cause a denial of service (application crash) via Javascript

References

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