CVE-2017-9420: Cross site scripting (XSS) vulnerability in the Spiffy Calendar plugin before 3.3.0 for WordPress allows remot

Routine

MEDIUM 6.1DOWNGRADE

CVE-2017-9420 is a medium-severity flaw (CVSS 6.1) affecting spiffy calendar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross site scripting (XSS) vulnerability in the Spiffy Calendar plugin before 3.3.0 for WordPress allows remote attackers to inject arbitrary JavaScript via the yr parameter.

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	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-79
Published	2017-06-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sunnythemes

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

Am I affected?

Timeline

2017-06-05 19:29 UTCPublished CVE record published
2026-06-17 01:28 UTCUpdated Record last modified

sunnythemes spiffy calendar DOWNGRADE

Affected: 1.0.0 · 1.0.1 · 1.0.2a · 1.0.3 · 1.1.0 · 1.1.1 · 1.1.2 · 1.1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy spiffy-calendar || rpm -q spiffy-calendar || spiffy-calendar --version

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison spiffy-calendar sudo apt install spiffy-calendar=<VERSION_BEFORE_1.0.0> sudo apt-mark hold spiffy-calendar

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

dnf --showduplicates list spiffy-calendar sudo dnf downgrade spiffy-calendar-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add spiffy-calendar

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-2017-9420?

spiffy calendar: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-9420 being exploited?

CVE-2017-9420 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-2017-9420 affect?

CVE-2017-9420 affects spiffy calendar. Severity is medium (CVSS 6.1). Cross site scripting (XSS) vulnerability in the Spiffy Calendar plugin before 3.3.0 for WordPress allows remote attackers to inject arbitrary JavaScript via the yr parameter.

How urgent is CVE-2017-9420?

Priority 39/100. No elevated risk signals yet.

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2024-45458 HIGH 7.1 UPGRADE Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Spiffy P
CVE-2024-45457 MEDIUM 6.5 UPGRADE Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Spiffy P
CVE-2024-38692 HIGH 7.6 UPGRADE Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Spiffy P
CVE-2024-30427 MEDIUM 5.4 UPGRADE Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Spiffy P
CVE-2024-0855 MEDIUM 5.3 UPGRADE The Spiffy Calendar WordPress plugin before 4.9.9 doesn't check the event_author parameter, and allows any use

References

← Back to latest CVEs