CVE-2013-3523: SQL injection vulnerability in This HTML Is Simple (THIS) before 1.2.4 allows remote to execute arbitrary SQL

Q: How do I fix CVE-2013-3523?

this: upgrade to newer than 1.2.3. Exact commands for each OS are on this page.

Q: Is CVE-2013-3523 being exploited?

CVE-2013-3523 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2013-3523 affect?

CVE-2013-3523 affects this. Severity is high (CVSS 7.5). SQL injection vulnerability in This HTML Is Simple (THIS) before 1.2.4 allows remote to execute arbitrary SQL commands via vectors related to op=page&id= in the URL.

This month

HIGH 7.5UPGRADE

CVE-2013-3523 is a high-severity flaw (CVSS 7.5) affecting this. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SQL injection vulnerability in This HTML Is Simple (THIS) before 1.2.4 allows remote to execute arbitrary SQL commands via vectors related to op=page&id= in the URL.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Weakness	CWE-89
Published	2013-05-10
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: gajennings

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

Am I affected?

Timeline

2013-05-10 21:55 UTCPublished CVE record published
2026-06-16 23:55 UTCUpdated Record last modified

gajennings this UPGRADE

Affected: <= 1.2.3 · 1.0.1 · 1.0.2 · 1.0.3 · 1.0.4 · 1.0.5 · 1.0.6 · 1.1.0

Fixed in: newer than 1.2.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.2.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade this

Note

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

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-2013-3523?

this: upgrade to newer than 1.2.3. Exact commands for each OS are on this page.

Is CVE-2013-3523 being exploited?

CVE-2013-3523 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-2013-3523 affect?

CVE-2013-3523 affects this. Severity is high (CVSS 7.5). SQL injection vulnerability in This HTML Is Simple (THIS) before 1.2.4 allows remote to execute arbitrary SQL commands via vectors related to op=page&id= in the URL.

How urgent is CVE-2013-3523?

Priority 45/100. High severity

References

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