CVE-2018-1000611: SURFnet OpenConext EngineBlock version 5.7.0 to 5.7.3 contains a Cross Site Scripting (XSS) vulnerability that

Routine

MEDIUM 6.1UPGRADE

CVE-2018-1000611 is a medium-severity flaw (CVSS 6.1) affecting openconext engineblock. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SURFnet OpenConext EngineBlock version 5.7.0 to 5.7.3 contains a Cross Site Scripting (XSS) vulnerability that can result in Allows an attacker to inject arbitrary web scripts or HTML into help and login pages. This attack appear to be exploitable via the victim opening a specially crafted URL.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

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 42%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-07-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: openconext

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

Am I affected?

Timeline

2018-07-09 20:29 UTCPublished CVE record published
2026-06-17 01:32 UTCUpdated Record last modified

openconext openconext engineblock UPGRADE

Affected: >= 5.7.0 and <= 5.7.3

Fixed in: newer than 5.7.3

Safe to downgrade to: a release before 5.7.0

1. Check installed version

apt-cache policy openconext-engineblock || rpm -q openconext-engineblock || openconext-engineblock --version

2. UPGRADE to newer than 5.7.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openconext-engineblock

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openconext-engineblock

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.7.0 (Debian / Ubuntu)

apt-cache madison openconext-engineblock sudo apt install openconext-engineblock=<VERSION_BEFORE_5.7.0> sudo apt-mark hold openconext-engineblock

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list openconext-engineblock sudo dnf downgrade openconext-engineblock-<VERSION_BEFORE_5.7.0> sudo dnf versionlock add openconext-engineblock

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-2018-1000611?

openconext engineblock: upgrade to newer than 5.7.3. Exact commands for each OS are on this page.

Is CVE-2018-1000611 being exploited?

CVE-2018-1000611 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-2018-1000611 affect?

CVE-2018-1000611 affects openconext engineblock. Severity is medium (CVSS 6.1). SURFnet OpenConext EngineBlock version 5.7.0 to 5.7.3 contains a Cross Site Scripting (XSS) vulnerability that can result in Allows an attacker to inject arbitrary web scripts or HTML into help and login pages. This attack appear to be expl

How urgent is CVE-2018-1000611?

Priority 36/100. No elevated risk signals yet.

References

← Back to latest CVEs