CVE-2026-13706: Improper input validation vulnerability in Wikimedia Foundation UrlShortener. This vulnerability is associat

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HIGH 8.8UPGRADE

CVE-2026-13706 is a high-severity flaw (CVSS 8.8) affecting mediawiki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper input validation vulnerability in Wikimedia Foundation UrlShortener. This vulnerability is associated with program files includes/UrlShortenerUtils.Php.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-07-01
Last modified	2026-10-25

Publisher (CNA): wikimedia-foundation · Vendor: mediawiki

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-01 16:16 UTCPublished CVE record published
2026-10-25 17:10 UTCUpdated Record last modified

mediawiki mediawiki UPGRADE

Affected: >= 1.43.0 and < 1.43.9 · >= 1.44.0 and < 1.44.6 · >= 1.45.0 and < 1.45.4 · 1.46.0 rc0

Fixed in: 1.43.9, 1.44.6, 1.45.4

Safe to downgrade to: a release before 1.43.0

1. Check installed version

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

2. UPGRADE to 1.43.9 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade 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 1.43.0 (Debian / Ubuntu)

apt-cache madison mediawiki sudo apt install mediawiki=<VERSION_BEFORE_1.43.0> sudo apt-mark hold mediawiki

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

dnf --showduplicates list mediawiki sudo dnf downgrade mediawiki-<VERSION_BEFORE_1.43.0> sudo dnf versionlock add 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.

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-2026-13706?

mediawiki: upgrade to 1.43.9, 1.44.6, 1.45.4. Exact commands for each OS are on this page.

Is CVE-2026-13706 being exploited?

CVE-2026-13706 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-2026-13706 affect?

CVE-2026-13706 affects mediawiki. Severity is high (CVSS 8.8). Improper input validation vulnerability in Wikimedia Foundation UrlShortener. This vulnerability is associated with program files includes/UrlShortenerUtils.Php.

How urgent is CVE-2026-13706?

Priority 41/100. High severity

Software pages

PHP vulnerabilities

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References

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