CVE-2018-12587: A cross-site scripting (XSS) vulnerability was found in valeuraddons German Spelling Dictionary v1.3 (an Opera

Routine

MEDIUM 6.1DOWNGRADE

CVE-2018-12587 is a medium-severity flaw (CVSS 6.1) affecting german spelling dictionary. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A cross-site scripting (XSS) vulnerability was found in valeuraddons German Spelling Dictionary v1.3 (an Opera Browser add-on). Instead of providing text for a spelling check, remote attackers may inject arbitrary web script or HTML via the ajax query parameter in the URL Address Bar.

Why this priority

No elevated risk signals yet

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 43%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-08-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: german spelling dictionary project

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

Am I affected?

Timeline

2018-08-13 17:29 UTCPublished CVE record published
2026-06-17 01:38 UTCUpdated Record last modified

german spelling dictionary project german spelling dictionary DOWNGRADE

Affected: 1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3

1. Check installed version

apt-cache policy german-spelling-dictionary || rpm -q german-spelling-dictionary || german-spelling-dictionary --version

2. No fixed release: DOWNGRADE to a release before 1.3 (Debian / Ubuntu)

apt-cache madison german-spelling-dictionary sudo apt install german-spelling-dictionary=<VERSION_BEFORE_1.3> sudo apt-mark hold german-spelling-dictionary

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

dnf --showduplicates list german-spelling-dictionary sudo dnf downgrade german-spelling-dictionary-<VERSION_BEFORE_1.3> sudo dnf versionlock add german-spelling-dictionary

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-2018-12587?

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

Is CVE-2018-12587 being exploited?

CVE-2018-12587 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-2018-12587 affect?

CVE-2018-12587 affects german spelling dictionary. Severity is medium (CVSS 6.1). A cross-site scripting (XSS) vulnerability was found in valeuraddons German Spelling Dictionary v1.3 (an Opera Browser add-on). Instead of providing text for a spelling check, remote attackers may inject arbitrary web script or HTML via the

How urgent is CVE-2018-12587?

Priority 36/100. No elevated risk signals yet.

References

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