CVE-2017-20268HighCVSS 8.8

Zap Calendar (com_zcalendar) <= 4.3.4 - Unauthenticated SQL Injection

Zap Calendar Lite 4.3.4 and earlier concatenate the eid request parameter straight into a SQL query with no escaping. An unauthenticated attacker can read arbitrary data from the Joomla database, including the user table and its password hashes, with a single crafted GET request. No fix was published for the 4.3.x line. Update to a current Zap Calendar release, or uninstall the component if it is no longer used.

Affected versions: ≤ 4.3.4

Official record: cve.org · NVD

Every connected Joomla site is checked against this rule on each audit, and flagged if it runs an affected version.

Check whether your sites are affected

How CVE-2017-20268 is scored

The base metrics as VulnCheck CNA published them, and what each one means for a site running an affected version. Threat and environmental metrics are left out: they describe a moment or a particular install rather than the flaw.

8.8 High

CVSS 4.0, scored by VulnCheck CNA

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

How it is reached

AV:N Attack vector: Network. Reachable across the internet
AC:L Attack complexity: Low. Nothing to work around, it just works
AT:N Attack requirements: None. Works against any affected install
PR:N Privileges required: None. No account needed
UI:N User interaction: None. Nobody has to be tricked into anything

What it does to the site

VC:H Confidentiality: High. Everything the site holds can be read
VI:L Integrity: Low. Some data can be altered
VA:N Availability: None. The site stays up

What it does beyond the site

SC:N Confidentiality: None. Other systems keep their data
SI:N Integrity: None. Other systems keep their integrity
SA:N Availability: None. Other systems stay up

Affected extensions and versions

CVE-2017-20268

Zap Calendar

Affected versions: ≤ 4.3.4

Full advisory: nvd.nist.gov

Running an affected version on a site you manage?

A free audit tells you which of your Joomla and WordPress sites run an affected version, which are out of date, and which have not been backed up. No card required. If a site is already compromised, fix.mysites.guru is a single fixed fee per incident, usually resolved the same day.

Rules current as of 3 October 2026.