CVE-2026-116883: Semantic MediaWiki from 3.1.0 before 7.3.1 contains a stored cross-site scripting vulnerability that allows au

Routine

MEDIUM 4.8UPGRADE

CVE-2026-116883 is a medium-severity flaw (CVSS 4.8) affecting semantic mediawiki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Semantic MediaWiki from 3.1.0 before 7.3.1 contains a stored cross-site scripting vulnerability that allows authenticated schema editors to inject HTML through schema descriptions. Attackers with the smw-schemaedit permission can save HTML that is passed unescaped to Html::rawElement() in HtmlBuilder, altering pages and targeting users who view the schema.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-10-27
Last modified	2026-11-04

Publisher (CNA): VulnCheck · Vendor: semantic-mediawiki

Last updated 2026-11-04 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-27 11:17 UTCPublished CVE record published
2026-11-04 15:10 UTCUpdated Record last modified

semantic-mediawiki semantic mediawiki UPGRADE

Affected: >= 3.1.0 and < 7.3.1

Fixed in: 7.3.1

Safe to downgrade to: a release before 3.1.0

1. Check installed version

apt-cache policy semantic-mediawiki || rpm -q semantic-mediawiki || semantic-mediawiki --version

2. UPGRADE to 7.3.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade semantic-mediawiki

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade semantic-mediawiki

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 3.1.0 (Debian / Ubuntu)

apt-cache madison semantic-mediawiki sudo apt install semantic-mediawiki=<VERSION_BEFORE_3.1.0> sudo apt-mark hold semantic-mediawiki

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

dnf --showduplicates list semantic-mediawiki sudo dnf downgrade semantic-mediawiki-<VERSION_BEFORE_3.1.0> sudo dnf versionlock add semantic-mediawiki

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.

Advisories and coverage

Research and news

Vulners Bulletins: CVE-2026-116883 2026-10-27

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-2026-116883?

semantic mediawiki: upgrade to 7.3.1. Exact commands for each OS are on this page.

Is CVE-2026-116883 being exploited?

CVE-2026-116883 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-2026-116883 affect?

CVE-2026-116883 affects semantic mediawiki. Severity is medium (CVSS 4.8). Semantic MediaWiki from 3.1.0 before 7.3.1 contains a stored cross-site scripting vulnerability that allows authenticated schema editors to inject HTML through schema descriptions. Attackers with the smw-schemaedit permission can save HTML

How urgent is CVE-2026-116883?

Priority 23/100. Public exploit reference

Related CVEs

CVE-2026-116878 HIGH 7.5 UPGRADE Semantic MediaWiki from 2.5.0 before 7.3.1 contains an uncontrolled resource consumption vulnerability that al
CVE-2026-116891 MEDIUM 6.1 UPGRADE SemanticMediaWiki from 4.2.0 before 7.2.1 contains a reflected cross-site scripting vulnerability that allows
CVE-2026-116879 MEDIUM 5.4 UPGRADE Semantic MediaWiki from 7.3.0 before 7.3.1 contains a missing authorization vulnerability in the smwtask updat
CVE-2026-116880 HIGH 7.1 UPGRADE Semantic MediaWiki from 3.0.0 before 7.3.1 contains a cross-site request forgery vulnerability in Special:SMWA
CVE-2026-116881 MEDIUM 6.1 UPGRADE Semantic MediaWiki from 3.0.0 before 7.3.1 contains a cross-site scripting vulnerability that allows attackers

References

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